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The causes of World War II, a global war from 1939 to 1945 that was the deadliest conflict in human history, have been given considerable attention by historians from many countries who studied and understood them. The immediate precipitating event was the
invasion of Poland The invasion of Poland (1 September – 6 October 1939) was a joint attack on the Republic of Poland by Nazi Germany and the Soviet Union which marked the beginning of World War II. The German invasion began on 1 September 1939, one week af ...
by
Nazi Germany Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...
on September 1, 1939, and the subsequent declarations of war on Germany made by
Britain Britain most often refers to: * The United Kingdom, a sovereign state in Europe comprising the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands * Great Britain, the largest island in the United King ...
and
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
, but many other prior events have been suggested as ultimate causes. Primary themes in historical analysis of the war's origins include the political takeover of Germany in 1933 by
Adolf Hitler Adolf Hitler (; 20 April 188930 April 1945) was an Austrian-born German politician who was dictator of Germany from 1933 until his death in 1945. He rose to power as the leader of the Nazi Party, becoming the chancellor in 1933 and the ...
and the
Nazi Party The Nazi Party, officially the National Socialist German Workers' Party (german: Nationalsozialistische Deutsche Arbeiterpartei or NSDAP), was a far-right political party in Germany active between 1920 and 1945 that created and supported t ...
;
Japanese militarism refers to the ideology in the Empire of Japan which advocates the belief that militarism should dominate the political and social life of the nation, and the belief that the strength of the military is equal to the strength of a nation. Histo ...
against
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's List of countries and dependencies by population, most populous country, with a Population of China, population exceeding 1.4 billion, slig ...
, which led to the
Second Sino-Japanese War The Second Sino-Japanese War (1937–1945) or War of Resistance (Chinese term) was a military conflict that was primarily waged between the Republic of China and the Empire of Japan. The war made up the Chinese theater of the wider Pacific T ...
;
Italian Italian(s) may refer to: * Anything of, from, or related to the people of Italy over the centuries ** Italians, an ethnic group or simply a citizen of the Italian Republic or Italian Kingdom ** Italian language, a Romance language *** Regional Ita ...
aggression against
Ethiopia Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the ...
, which led to the
Second Italo-Ethiopian War The Second Italo-Ethiopian War, also referred to as the Second Italo-Abyssinian War, was a war of aggression which was fought between Fascist Italy (1922–1943), Italy and Ethiopian Empire, Ethiopia from October 1935 to February 1937. In Ethio ...
and Germany's initial success in negotiating the
Molotov–Ribbentrop Pact , long_name = Treaty of Non-Aggression between Germany and the Union of Soviet Socialist Republics , image = Bundesarchiv Bild 183-H27337, Moskau, Stalin und Ribbentrop im Kreml.jpg , image_width = 200 , caption = Stalin and Ribbentrop shaking ...
with the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...
to divide the territorial control of
Eastern Europe Eastern Europe is a subregion of the European continent. As a largely ambiguous term, it has a wide range of geopolitical, geographical, ethnic, cultural, and socio-economic connotations. The vast majority of the region is covered by Russia, whi ...
between them. During the
interwar period In the history of the 20th century, the interwar period lasted from 11 November 1918 to 1 September 1939 (20 years, 9 months, 21 days), the end of the First World War to the beginning of the Second World War. The interwar period was relative ...
, deep anger arose in the
Weimar Republic The Weimar Republic (german: link=no, Weimarer Republik ), officially named the German Reich, was the government of Germany from 1918 to 1933, during which it was a Constitutional republic, constitutional federal republic for the first time in ...
on the conditions of the 1919
Treaty of Versailles The Treaty of Versailles (french: Traité de Versailles; german: Versailler Vertrag, ) was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was signed on 28 June 1 ...
, which punished Germany for its role in
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, ...
with severe conditions and heavy financial
reparations Reparation(s) may refer to: Christianity * Restitution (theology), the Christian doctrine calling for reparation * Acts of reparation, prayers for repairing the damages of sin History *War reparations **World War I reparations, made from ...
to prevent it from ever becoming a military power again. That provoked strong currents of
revanchism Revanchism (french: revanchisme, from ''revanche'', "revenge") is the political manifestation of the will to reverse territorial losses incurred by a country, often following a war or social movement. As a term, revanchism originated in 1870s Fr ...
in German politics, with complaints primarily focused on the
demilitarisation Demilitarisation or demilitarization may mean the reduction of state armed forces; it is the opposite of militarisation in many respects. For instance, the demilitarisation of Northern Ireland entailed the reduction of British security and military ...
of the
Rhineland The Rhineland (german: Rheinland; french: Rhénanie; nl, Rijnland; ksh, Rhingland; Latinised name: ''Rhenania'') is a loosely defined area of Western Germany along the Rhine, chiefly its middle section. Term Historically, the Rhinelands ...
, the prohibition of German unification with
Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...
and the loss of some German-speaking territories and overseas colonies. During the worldwide economic crisis of the
Great Depression The Great Depression (19291939) was an economic shock that impacted most countries across the world. It was a period of economic depression that became evident after a major fall in stock prices in the United States. The economic contagio ...
in the 1930s, many people lost faith in democracy and countries across the world turned to authoritarian regimes. In Germany, resentment and hatred of other countries was intensified by the instability of the German political system, as many activists rejected the Weimar Republic's legitimacy. The most extreme political aspirant to emerge from that situation was
Adolf Hitler Adolf Hitler (; 20 April 188930 April 1945) was an Austrian-born German politician who was dictator of Germany from 1933 until his death in 1945. He rose to power as the leader of the Nazi Party, becoming the chancellor in 1933 and the ...
, the leader of the
Nazi Party The Nazi Party, officially the National Socialist German Workers' Party (german: Nationalsozialistische Deutsche Arbeiterpartei or NSDAP), was a far-right political party in Germany active between 1920 and 1945 that created and supported t ...
. The Nazis took totalitarian power in Germany from 1933 and demanded the undoing of the Versailles provisions. Their ambitious and aggressive domestic and foreign policies reflected their ideologies of
Antisemitism Antisemitism (also spelled anti-semitism or anti-Semitism) is hostility to, prejudice towards, or discrimination against Jews. A person who holds such positions is called an antisemite. Antisemitism is considered to be a form of racism. Antis ...
, unification of all Germans, the acquisition of "living space" (''
Lebensraum (, ''living space'') is a German concept of settler colonialism, the philosophy and policies of which were common to German politics from the 1890s to the 1940s. First popularized around 1901, '' lso in:' became a geopolitical goal of Imper ...
'') for agrarian settlers, the elimination of
Bolshevism Bolshevism (from Bolshevik) is a revolutionary socialist current of Soviet Marxist–Leninist political thought and political regime associated with the formation of a rigidly centralized, cohesive and disciplined party of social revolution, ...
and the hegemony of an "
Aryan Aryan or Arya (, Indo-Iranian *''arya'') is a term originally used as an ethnocultural self-designation by Indo-Iranians in ancient times, in contrast to the nearby outsiders known as 'non-Aryan' (*''an-arya''). In Ancient India, the term ...
"/" Nordic"
master race The master race (german: Herrenrasse) is a pseudoscientific concept in Nazi ideology in which the putative "Aryan race" is deemed the pinnacle of human racial hierarchy. Members were referred to as "''Herrenmenschen''" ("master humans"). T ...
over "subhumans" (''
Untermenschen ''Untermensch'' (, ; plural: ''Untermenschen'') is a Nazi term for non-Aryan "inferior people" who were often referred to as "the masses from the East", that is Jews, Roma, and Slavs (mainly ethnic Poles, Serbs, and later also Russians). The ...
'') such as
Jews Jews ( he, יְהוּדִים, , ) or Jewish people are an ethnoreligious group and nation originating from the Israelites Israelite origins and kingdom: "The first act in the long drama of Jewish history is the age of the Israelites""The ...
and
Slavs Slavs are the largest European ethnolinguistic group. They speak the various Slavic languages, belonging to the larger Balto-Slavic branch of the Indo-European languages. Slavs are geographically distributed throughout northern Eurasia, main ...
. Other factors leading to the war included the aggression by Fascist Italy against Ethiopia and by
Imperial Japan The also known as the Japanese Empire or Imperial Japan, was a historical nation-state and great power that existed from the Meiji Restoration in 1868 until the enactment of the post-World War II 1947 constitution and subsequent forma ...
against
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's List of countries and dependencies by population, most populous country, with a Population of China, population exceeding 1.4 billion, slig ...
. At first, the aggressive moves met with only feeble and ineffectual policies of
appeasement Appeasement in an international context is a diplomatic policy of making political, material, or territorial concessions to an aggressive power in order to avoid conflict. The term is most often applied to the foreign policy of the UK governme ...
from the other major world powers. The
League of Nations The League of Nations (french: link=no, Société des Nations ) was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 by the Paris Peace Conference th ...
proved helpless, especially regarding China and Ethiopia. A decisive proximate event was the 1938 Munich Conference, which formally approved Germany's annexation of the
Sudetenland The Sudetenland ( , ; Czech and sk, Sudety) is the historical German name for the northern, southern, and western areas of former Czechoslovakia which were inhabited primarily by Sudeten Germans. These German speakers had predominated in the ...
from Czechoslovakia. Hitler promised it was his last territorial claim, but in early 1939, he became even more aggressive, and European governments finally realised that appeasement would not guarantee peace. Britain and France rejected diplomatic efforts to form a military alliance with the Soviet Union, and Hitler instead offered Stalin a better deal in the Molotov–Ribbentrop Pact of August 1939. An alliance formed by Germany, Japan and Italy led to the establishment of the
Axis powers The Axis powers, ; it, Potenze dell'Asse ; ja, 枢軸国 ''Sūjikukoku'', group=nb originally called the Rome–Berlin Axis, was a military coalition that initiated World War II and fought against the Allies. Its principal members were ...
.


Ultimate causes


Legacies of World War I

By the end of
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, ...
in late 1918, the world's social and geopolitical circumstances had fundamentally and irrevocably changed. The
Allies An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether or not explicit agreement has been worked out among them. Members of an alliance are called ...
had been victorious, but many of Europe's economies and infrastructures had been devastated, including those of the victors. France, along with the other victors, was in a desperate situation regarding its economy, security and morale and understood that its position in 1918 was "artificial and transitory". Paxton, p. 145 Thus, French Prime Minister
Georges Clemenceau Georges Benjamin Clemenceau (, also , ; 28 September 1841 – 24 November 1929) was a French statesman who served as Prime Minister of France from 1906 to 1909 and again from 1917 until 1920. A key figure of the Independent Radicals, he was a ...
worked to gain French security via the
Treaty of Versailles The Treaty of Versailles (french: Traité de Versailles; german: Versailler Vertrag, ) was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was signed on 28 June 1 ...
, and French security demands, such as reparations, coal payments, and a demilitarised Rhineland, took precedence at the Paris Peace Conference of 1919–1920, which designed the treaty. The war "must be someone's fault – and that's a very natural human reaction", analysed the historian
Margaret MacMillan Margaret Olwen MacMillan, (born 1943) is a Canadian historian and professor at the University of Oxford. She is former provost of Trinity College, Toronto, and professor of history at the University of Toronto and previously at Ryerson Univer ...
.
Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwee ...
was charged with the sole responsibility of starting World War I, and the War Guilt Clause was the first step to satisfying revenge for the victor countries, especially France, against Germany. Roy H. Ginsberg argued, "France was greatly weakened and, in its weakness and fear of a resurgent Germany, sought to isolate and punish Germany.... French revenge would come back to haunt France during the Nazi invasion and occupation twenty years later". The two main provisions of the French security agenda were
war reparations War reparations are compensation payments made after a war by one side to the other. They are intended to cover damage or injury inflicted during a war. History Making one party pay a war indemnity is a common practice with a long history. ...
from Germany in the form of money and coal and a detached German
Rhineland The Rhineland (german: Rheinland; french: Rhénanie; nl, Rijnland; ksh, Rhingland; Latinised name: ''Rhenania'') is a loosely defined area of Western Germany along the Rhine, chiefly its middle section. Term Historically, the Rhinelands ...
. The French government printed excess currency, which created inflation, to compensate for the lack of funds, and it borrowed money from the United States. Reparations from Germany were needed to stabilise the French economy. France also demanded for Germany to give France its coal supply from the
Ruhr The Ruhr ( ; german: Ruhrgebiet , also ''Ruhrpott'' ), also referred to as the Ruhr area, sometimes Ruhr district, Ruhr region, or Ruhr valley, is a polycentric urban area in North Rhine-Westphalia, Germany. With a population density of 2,800/km ...
to compensate for the destruction of French coal mines during the war. The French demanded an amount of coal that was a "technical impossibility" for the Germans to pay. France also insisted on the
demilitarisation Demilitarisation or demilitarization may mean the reduction of state armed forces; it is the opposite of militarisation in many respects. For instance, the demilitarisation of Northern Ireland entailed the reduction of British security and military ...
of the German Rhineland in the hope of hindering any possibility of a future German attack and giving France a physical security barrier between itself and Germany. Paxton, p. 151 The inordinate amount of reparations, coal payments and the principle of a demilitarised Rhineland were largely viewed by the Germans as insulting and unreasonable. The resulting
Treaty of Versailles The Treaty of Versailles (french: Traité de Versailles; german: Versailler Vertrag, ) was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was signed on 28 June 1 ...
brought a formal end to the war but was judged by governments on all sides of the conflict. It was neither lenient enough to appease
Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwee ...
nor harsh enough to prevent it from becoming a dominant continental power again. The German people largely viewed the treaty as placing the blame, or "war guilt", on Germany and
Austria-Hungary Austria-Hungary, often referred to as the Austro-Hungarian Empire,, the Dual Monarchy, or Austria, was a constitutional monarchy and great power in Central Europe between 1867 and 1918. It was formed with the Austro-Hungarian Compromise of ...
and as punishing them for their "responsibility", rather than working out an agreement that would assure long-term peace. The treaty imposed harsh monetary reparations and requirements for demilitarisation and territorial dismemberment, caused mass ethnic resettlement and separated millions of ethnic Germans into neighbouring countries. In the effort to pay war reparations to Britain and France, the
Weimar Republic The Weimar Republic (german: link=no, Weimarer Republik ), officially named the German Reich, was the government of Germany from 1918 to 1933, during which it was a Constitutional republic, constitutional federal republic for the first time in ...
printed trillions of marks, which caused
hyperinflation In economics, hyperinflation is a very high and typically accelerating inflation. It quickly erodes the real value of the local currency, as the prices of all goods increase. This causes people to minimize their holdings in that currency as t ...
. Robert O. Paxton stated, "No postwar German government believed it could accept such a burden on future generations and survive...". Paxton, p. 153 Paying reparations to the victorious side had been a traditional punishment with a long history of use, but it was the "extreme immoderation" that caused German resentment. Germany did not make its last World War I reparation payment until 3 October 2010, 92 years after the end of the war. Germany also fell behind its coal payments because of a
passive resistance Nonviolent resistance (NVR), or nonviolent action, sometimes called civil resistance, is the practice of achieving goals such as social change through symbolic protests, civil disobedience, economic or political noncooperation, satyagraha, c ...
movement against France. In response, the French invaded the Ruhr and occupied it. By then, most Germans had become enraged with the French and placed the blame for their humiliation on the Weimar Republic.
Adolf Hitler Adolf Hitler (; 20 April 188930 April 1945) was an Austrian-born German politician who was dictator of Germany from 1933 until his death in 1945. He rose to power as the leader of the Nazi Party, becoming the chancellor in 1933 and the ...
, a leader of the Nazi Party, attempted a coup d'état in 1923 in what became known as the
Beer Hall Putsch The Beer Hall Putsch, also known as the Munich Putsch,Dan Moorhouse, ed schoolshistory.org.uk, accessed 2008-05-31.Known in German as the or was a failed coup d'état by Nazi Party ( or NSDAP) leader Adolf Hitler, Erich Ludendorff and othe ...
, and he intended to establish a
Greater Germanic Reich The Greater Germanic Reich (german: Großgermanisches Reich), fully styled the Greater Germanic Reich of the German Nation (german: Großgermanisches Reich deutscher Nation), was the official state name of the political entity that Nazi Germany ...
. Although he failed, Hitler gained recognition as a national hero by the German population. During the war,
German colonies German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...
outside Europe had been annexed by the Allies, and Italy took the southern half of
Tyrol Tyrol (; historically the Tyrole; de-AT, Tirol ; it, Tirolo) is a historical region in the Alps - in Northern Italy and western Austria. The area was historically the core of the County of Tyrol, part of the Holy Roman Empire, Austrian Emp ...
after the armistice. The war in the east had ended with the defeat and the collapse of the
Russian Empire The Russian Empire was an empire and the final period of the Russian monarchy from 1721 to 1917, ruling across large parts of Eurasia. It succeeded the Tsardom of Russia following the Treaty of Nystad, which ended the Great Northern War ...
, and German troops had occupied large parts of
Eastern Eastern may refer to: Transportation *China Eastern Airlines, a current Chinese airline based in Shanghai *Eastern Air, former name of Zambia Skyways *Eastern Air Lines, a defunct American airline that operated from 1926 to 1991 *Eastern Air Li ...
and
Central Europe Central Europe is an area of Europe between Western Europe and Eastern Europe, based on a common historical, social and cultural identity. The Thirty Years' War (1618–1648) between Catholicism and Protestantism significantly shaped the a ...
with varying degrees of control and established various
client states A client state, in international relations, is a state that is economically, politically, and/or militarily subordinate to another more powerful state (called the "controlling state"). A client state may variously be described as satellite state, ...
such as a
kingdom of Poland The Kingdom of Poland ( pl, Królestwo Polskie; Latin: ''Regnum Poloniae'') was a state in Central Europe. It may refer to: Historical political entities * Kingdom of Poland, a kingdom existing from 1025 to 1031 * Kingdom of Poland, a kingdom exi ...
and the
United Baltic Duchy The United Baltic Duchy (german: Vereinigtes Baltisches Herzogtum, lv, Apvienotā Baltijas hercogiste, et, Balti Hertsogiriik), or alternatively the Grand Duchy of Livonia, was the name proposed during World War I by leaders of the local ...
. The
German Navy The German Navy (, ) is the navy of Germany and part of the unified ''Bundeswehr'' (Federal Defense), the German Armed Forces. The German Navy was originally known as the ''Bundesmarine'' (Federal Navy) from 1956 to 1995, when ''Deutsche Mari ...
spent most of the war in port, only to be turned over to the Allies. It was
scuttled Scuttling is the deliberate sinking of a ship. Scuttling may be performed to dispose of an abandoned, old, or captured vessel; to prevent the vessel from becoming a navigation hazard; as an act of self-destruction to prevent the ship from being ...
by its own officers to avoid it from being surrendered. Decades later, the lack of an obvious military defeat would be one of the pillars holding together the '' Dolchstosslegende'' ("stab-in-the-back myth"), which gave the Nazis another propaganda tool. The demilitarised
Rhineland The Rhineland (german: Rheinland; french: Rhénanie; nl, Rijnland; ksh, Rhingland; Latinised name: ''Rhenania'') is a loosely defined area of Western Germany along the Rhine, chiefly its middle section. Term Historically, the Rhinelands ...
and the additional cutbacks on military also infuriated the Germans. Although France logically wanted the Rhineland to be a neutral zone, France had the power to make their desire happen, which merely exacerbated German resentment of the French. In addition, the Treaty of Versailles dissolved the German general staff, and possession of navy ships, aircraft, poison gas, tanks and heavy artillery was also made illegal. The humiliation of being bossed around by the victor countries, especially France, and being stripped of their prized military made the Germans resent the Weimar Republic and idolise anyone who stood up to it. Austria also found the treaty unjust, which encouraged Hitler's popularity. The conditions generated bitter resentment towards the war's victors, who had promised the Germans that US President
Woodrow Wilson Thomas Woodrow Wilson (December 28, 1856February 3, 1924) was an American politician and academic who served as the 28th president of the United States from 1913 to 1921. A member of the Democratic Party, Wilson served as the president of ...
's
Fourteen Points U.S. President Woodrow Wilson The Fourteen Points was a statement of principles for peace that was to be used for peace negotiations in order to end World War I. The principles were outlined in a January 8, 1918 speech on war aims and peace terms ...
would be a guideline for peace; but the Americans had played only a minor role in the war, and Wilson could not convince the Allies to agree to adopt his Fourteen Points. Many Germans felt that the German government had agreed to an
armistice An armistice is a formal agreement of warring parties to stop fighting. It is not necessarily the end of a war, as it may constitute only a cessation of hostilities while an attempt is made to negotiate a lasting peace. It is derived from the ...
based on that understanding, and others felt that the
German Revolution of 1918–1919 The German Revolution or November Revolution (german: Novemberrevolution) was a civil conflict in the German Empire at the end of the First World War that resulted in the replacement of the German federal constitutional monarchy with a d ...
had been orchestrated by the " November criminals", who later assumed office in the new Weimar Republic. The Japanese also started to express resentment against
Western Europe Western Europe is the western region of Europe. The region's countries and territories vary depending on context. The concept of "the West" appeared in Europe in juxtaposition to "the East" and originally applied to the ancient Mediterranean ...
for how they were treated during the negotiations of the Treaty of Versailles. The Japanese proposition to discuss the issue of racial equality was not put in the final draft because of many other Allies, and the Japanese participation in the war caused little reward for the country. The war's economic and psychological legacies persisted well into the
Interwar period In the history of the 20th century, the interwar period lasted from 11 November 1918 to 1 September 1939 (20 years, 9 months, 21 days), the end of the First World War to the beginning of the Second World War. The interwar period was relative ...
.


Failure of League of Nations

The
League of Nations The League of Nations (french: link=no, Société des Nations ) was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 by the Paris Peace Conference th ...
was an international peacekeeping organization founded in 1919 with the explicit goal of preventing future wars. The League's methods included
disarmament Disarmament is the act of reducing, limiting, or abolishing weapons. Disarmament generally refers to a country's military or specific type of weaponry. Disarmament is often taken to mean total elimination of weapons of mass destruction, such a ...
,
collective security Collective security can be understood as a security arrangement, political, regional, or global, in which each state in the system accepts that the security of one is the concern of all, and therefore commits to a collective response to threats ...
, the settlement disputes between countries by negotiations and diplomacy and the improvement global welfare. The diplomatic philosophy behind the League represented a fundamental shift in thought from the preceding century. The old philosophy of "concert of nations", which grew out of the
Congress of Vienna The Congress of Vienna (, ) of 1814–1815 was a series of international diplomatic meetings to discuss and agree upon a possible new layout of the European political and constitutional order after the downfall of the French Emperor Napoleon ...
(1815), saw Europe as a shifting map of alliances among
nation-states A nation state is a political unit where the state and nation are congruent. It is a more precise concept than " country", since a country does not need to have a predominant ethnic group. A nation, in the sense of a common ethnicity, m ...
, which created a balance of power that was maintained by strong armies and secret agreements. Under the new philosophy, the League would act as a government of governments, with the role of settling disputes between individual nations in an open and legalist forum. Despite Wilson's advocacy, the United States never joined the League of Nations. The League lacked an armed force of its own and so depended on member nations to enforce its resolutions, uphold economic sanctions that the League ordered or provide an army when needed for the League to use. However, individual governments were often very reluctant to do so. After numerous notable successes and some early failures in the 1920s, the League ultimately proved incapable of preventing aggression by the
Axis Powers The Axis powers, ; it, Potenze dell'Asse ; ja, 枢軸国 ''Sūjikukoku'', group=nb originally called the Rome–Berlin Axis, was a military coalition that initiated World War II and fought against the Allies. Its principal members were ...
in the 1930s. The reliance upon unanimous decisions, the lack of an independent body of armed forces and the continued self-interest of its leading members meant that the failure was arguably inevitable.


Expansionism and militarism

Expansionism Expansionism refers to states obtaining greater territory through military empire-building or colonialism. In the classical age of conquest moral justification for territorial expansion at the direct expense of another established polity (who of ...
is the doctrine of expanding the territorial base or economic influence of a country, usually by means of military aggression.
Militarism Militarism is the belief or the desire of a government or a people that a state should maintain a strong military capability and to use it aggressively to expand national interests and/or values. It may also imply the glorification of the mili ...
is the principle or policy of maintaining a strong
military A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. It is typically authorized and maintained by a sovereign state, with its members identifiable by their distinct ...
capability to use aggressively to expand national interests and/or values, with the view that military efficiency is the supreme ideal of a state. The Treaty of Versailles and the League of Nations had sought to stifle expansionist and militarist policies by all actors, but the conditions imposed by their creators imposed on the world's new geopolitical situation and the technological circumstances of the era only emboldened the re-emergence of those ideologies during the Interwar Period. By the early 1930s, a militaristic and aggressive national ideology prevailed in
Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwee ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the n ...
and
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...
. The attitude fuelled advancements in military technology, subversive propaganda and ultimately territorial expansion. It has been observed that the leaders of countries that have been suddenly militarised often feel a need to prove that their armies are formidable, which was often a contributing factor in the start of conflicts such as the
Second Italo-Ethiopian War The Second Italo-Ethiopian War, also referred to as the Second Italo-Abyssinian War, was a war of aggression which was fought between Fascist Italy (1922–1943), Italy and Ethiopian Empire, Ethiopia from October 1935 to February 1937. In Ethio ...
and the
Second Sino-Japanese War The Second Sino-Japanese War (1937–1945) or War of Resistance (Chinese term) was a military conflict that was primarily waged between the Republic of China and the Empire of Japan. The war made up the Chinese theater of the wider Pacific T ...
. In Italy,
Benito Mussolini Benito Amilcare Andrea Mussolini (; 29 July 188328 April 1945) was an Italian politician and journalist who founded and led the National Fascist Party. He was Prime Minister of Italy from the March on Rome in 1922 until his deposition in ...
sought to create a
New Roman Empire The Italian colonial empire ( it, Impero coloniale italiano), known as the Italian Empire (''Impero Italiano'') between 1936 and 1943, began in Africa in the 19th century and comprised the colonies, protectorates, concessions and dependencie ...
, based around the
Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on ...
. Italy invaded
Ethiopia Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the ...
as early as 1935,
Albania Albania ( ; sq, Shqipëri or ), or , also or . officially the Republic of Albania ( sq, Republika e Shqipërisë), is a country in Southeastern Europe. It is located on the Adriatic and Ionian Seas within the Mediterranean Sea and share ...
in early 1938, and later
Greece Greece,, or , romanized: ', officially the Hellenic Republic, is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. Greece shares land borders wi ...
. The invasion of Ethiopia provoked angry words and a failed oil embargo from the League of Nations. ''
Spazio vitale (, "living space") was the territorial expansionist concept of Italian Fascism. It was defined in universal terms as "that part of the globe over which extends either the vital requirements or expansionary impetus of a state with strong unit ...
'' ("living space") was the territorial
expansionist Expansionism refers to states obtaining greater territory through military empire-building or colonialism. In the classical age of conquest moral justification for territorial expansion at the direct expense of another established polity (who ...
concept of Italian Fascism. It was analogous to Nazi Germany's concept of ''
Lebensraum (, ''living space'') is a German concept of settler colonialism, the philosophy and policies of which were common to German politics from the 1890s to the 1940s. First popularized around 1901, '' lso in:' became a geopolitical goal of Imper ...
'' and the United States' concept of "
Manifest Destiny Manifest destiny was a cultural belief in the 19th-century United States that American settlers were destined to expand across North America. There were three basic tenets to the concept: * The special virtues of the American people and th ...
". Fascist ideologist
Giuseppe Bottai Giuseppe Bottai (3 September 1895 – 9 January 1959) was an Italian journalist, and member of the National Fascist Party of Benito Mussolini. Early life Born in Rome, Giuseppe was son of Luigi, a wine dealer with republican sympathies, and Elen ...
likened this historic mission to the deeds of the
ancient Romans In modern historiography, ancient Rome refers to Roman civilisation from the founding of the city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD. It encompasses the Roman Kingdom (753–50 ...
. Under the Nazi regime, Germany began its own program of expansion that sought to restore its "rightful" boundaries. As a prelude toward its goals, the
Rhineland The Rhineland (german: Rheinland; french: Rhénanie; nl, Rijnland; ksh, Rhingland; Latinised name: ''Rhenania'') is a loosely defined area of Western Germany along the Rhine, chiefly its middle section. Term Historically, the Rhinelands ...
was remilitarised in March 1936. Also of importance was the idea of a Greater Germany, supporters of which hoped to unite the
German people , native_name_lang = de , region1 = , pop1 = 72,650,269 , region2 = , pop2 = 534,000 , region3 = , pop3 = 157,000 3,322,405 , region4 = , pop4 = ...
under one nation-state to include all territories inhabited by Germans, even if they happened to be a minority in a particular territory. After the Treaty of Versailles, a unification between Germany and the newly formed German-Austria, a
rump state A rump state is the remnant of a once much larger state, left with a reduced territory in the wake of secession, annexation, occupation, decolonization, or a successful coup d'état or revolution on part of its former territory. In the last case ...
of
Austria-Hungary Austria-Hungary, often referred to as the Austro-Hungarian Empire,, the Dual Monarchy, or Austria, was a constitutional monarchy and great power in Central Europe between 1867 and 1918. It was formed with the Austro-Hungarian Compromise of ...
, was prohibited by the Allies, despite the large majority of
Austrians , pop = 8–8.5 million , regions = 7,427,759 , region1 = , pop1 = 684,184 , ref1 = , region2 = , pop2 = 345,620 , ref2 = , region3 = , pop3 = 197,990 , ref3 ...
supporting the idea. During the Weimar Republic (1919–1933), the
Kapp Putsch The Kapp Putsch (), also known as the Kapp–Lüttwitz Putsch (), was an attempted coup against the German national government in Berlin on 13 March 1920. Named after its leaders Wolfgang Kapp and Walther von Lüttwitz, its goal was to undo th ...
, an attempted
coup d'état A coup d'état (; French for 'stroke of state'), also known as a coup or overthrow, is a seizure and removal of a government and its powers. Typically, it is an illegal seizure of power by a political faction, politician, cult, rebel group, m ...
against the republican government, was launched by disaffected members of the armed forces. Later, some of the more radical militarists and nationalists were submerged in grief and despair into the Nazi Party, and more moderate elements of militarism declined. The result was an influx of militarily-inclined men into the Nazi Party. Combined with its racial theories, that fuelled
irredentist Irredentism is usually understood as a desire that one state annexes a territory of a neighboring state. This desire is motivated by ethnic reasons (because the population of the territory is ethnically similar to the population of the parent st ...
sentiments and put Germany on a collision course for war with its immediate neighbours. In Asia, the
Empire of Japan The also known as the Japanese Empire or Imperial Japan, was a historical nation-state and great power that existed from the Meiji Restoration in 1868 until the enactment of the post-World War II 1947 constitution and subsequent form ...
harboured expansionist desires towards
Manchuria Manchuria is an exonym (derived from the endo demonym " Manchu") for a historical and geographic region in Northeast Asia encompassing the entirety of present-day Northeast China (Inner Manchuria) and parts of the Russian Far East (Outer M ...
and the
Republic of China Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeas ...
. Two contemporaneous factors in Japan contributed both to the growing power of its military and the chaos in its ranks before World War I. One was the
Cabinet Cabinet or The Cabinet may refer to: Furniture * Cabinetry, a box-shaped piece of furniture with doors and/or drawers * Display cabinet, a piece of furniture with one or more transparent glass sheets or transparent polycarbonate sheets * Filin ...
Law, which required the
Imperial Japanese Army The was the official ground-based armed force of the Empire of Japan from 1868 to 1945. It was controlled by the Imperial Japanese Army General Staff Office and the Ministry of the Army, both of which were nominally subordinate to the Emper ...
(IJA) and the
Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender ...
(IJN) to nominate cabinet members before changes could be formed. That essentially gave the military a veto power over the formation of any Cabinet in the ostensibly-parliamentary country. The other factor was '' gekokujō'', the institutionalized
disobedience Civil disobedience is the active, professed refusal of a citizen to obey certain laws, demands, orders or commands of a government (or any other authority). By some definitions, civil disobedience has to be nonviolent to be called "civil". Henc ...
by junior officers. It was common for radical junior officers to press their goals to the extent of assassinating their seniors. In 1936, the phenomenon resulted in the February 26 Incident in which junior officers attempted a coup d'état and killed leading members of the Japanese government. In the 1930s, the
Great Depression The Great Depression (19291939) was an economic shock that impacted most countries across the world. It was a period of economic depression that became evident after a major fall in stock prices in the United States. The economic contagio ...
wrecked Japan's economy and gave radical elements within the Japanese military the chance to force the entire military into working towards the conquest of all of Asia. For example, in 1931, the
Kwantung Army ''Kantō-gun'' , image = Kwantung Army Headquarters.JPG , image_size = 300px , caption = Kwantung Army headquarters in Hsinking, Manchukuo , dates = April ...
, a Japanese military force stationed in
Manchuria Manchuria is an exonym (derived from the endo demonym " Manchu") for a historical and geographic region in Northeast Asia encompassing the entirety of present-day Northeast China (Inner Manchuria) and parts of the Russian Far East (Outer M ...
, staged the
Mukden Incident The Mukden Incident, or Manchurian Incident, known in Chinese as the 9.18 Incident (九・一八), was a false flag event staged by Japanese military personnel as a pretext for the 1931 Japanese invasion of Manchuria. On September 18, 1931, ...
, which sparked the invasion of Manchuria and its transformation into the Japanese puppet state of
Manchukuo Manchukuo, officially the State of Manchuria prior to 1934 and the Empire of (Great) Manchuria after 1934, was a puppet state of the Empire of Japan in Manchuria from 1932 until 1945. It was founded as a republic in 1932 after the Japanese ...
.


Germans vs. Slavs

Twentieth-century events marked the culmination of a millennium-long process of intermingling between Germans and
Slavic people Slavs are the largest European ethnolinguistic group. They speak the various Slavic languages, belonging to the larger Balto-Slavic branch of the Indo-European languages. Slavs are geographically distributed throughout northern Eurasia, main ...
. The rise of nationalism in the 19th century made race a centerpiece of political loyalty. The rise of the nation-state had given way to the politics of identity, including
pan-Germanism Pan-Germanism (german: Pangermanismus or '), also occasionally known as Pan-Germanicism, is a pan-nationalist political idea. Pan-Germanists originally sought to unify all the German-speaking people – and possibly also Germanic-speaking ...
and
pan-Slavism Pan-Slavism, a movement which crystallized in the mid-19th century, is the political ideology concerned with the advancement of integrity and unity for the Slavic people. Its main impact occurred in the Balkans, where non-Slavic empires had rule ...
. Furthermore,
Social Darwinist Social Darwinism refers to various theories and societal practices that purport to apply biological concepts of natural selection and survival of the fittest to sociology, economics and politics, and which were largely defined by scholars in We ...
theories framed the coexistence as a "Teuton vs. Slav" struggle for domination, land, and limited resources. Integrating these ideas into their own worldview, the Nazis believed that the Germans, the "
Aryan race The Aryan race is an obsolete historical race concept that emerged in the late-19th century to describe people of Proto-Indo-European heritage as a racial grouping. The terminology derives from the historical usage of Aryan, used by modern ...
", were the
master race The master race (german: Herrenrasse) is a pseudoscientific concept in Nazi ideology in which the putative "Aryan race" is deemed the pinnacle of human racial hierarchy. Members were referred to as "''Herrenmenschen''" ("master humans"). T ...
and that the Slavs were inferior.


Japan's seizure of resources and markets

Other than a few coal and iron deposits and a small oil field on
Sakhalin Island Sakhalin ( rus, Сахали́н, r=Sakhalín, p=səxɐˈlʲin; ja, 樺太 ''Karafuto''; zh, c=, p=Kùyèdǎo, s=库页岛, t=庫頁島; Manchu: ᠰᠠᡥᠠᠯᡳᠶᠠᠨ, ''Sahaliyan''; Orok: Бугата на̄, ''Bugata nā''; Nivkh ...
, Japan lacked strategic mineral resources. In the early 20th century, in the
Russo-Japanese War The Russo-Japanese War ( ja, 日露戦争, Nichiro sensō, Japanese-Russian War; russian: Ру́сско-япóнская войнá, Rússko-yapónskaya voyná) was fought between the Empire of Japan and the Russian Empire during 1904 and 1 ...
, Japan had succeeded in pushing back the East Asian expansion of the Russian Empire in competition for
Korea Korea ( ko, 한국, or , ) is a peninsular region in East Asia. Since 1945, it has been divided at or near the 38th parallel, with North Korea (Democratic People's Republic of Korea) comprising its northern half and South Korea (Republic ...
and
Manchuria Manchuria is an exonym (derived from the endo demonym " Manchu") for a historical and geographic region in Northeast Asia encompassing the entirety of present-day Northeast China (Inner Manchuria) and parts of the Russian Far East (Outer M ...
. Japan's goal after 1931 was economic dominance of most of East Asia, often expressed in the Pan-Asian terms of "Asia for the Asians". Japan was determined to dominate the China market, which the US and other European powers had been dominating. On October 19, 1939, US Ambassador to Japan Joseph C. Grew, in a formal address to the America-Japan Society, stated that In 1931, Japan invaded Manchuria and China proper. Under the guise of the
Greater East Asia Co-Prosperity Sphere The , also known as the GEACPS, was a concept that was developed in the Empire of Japan and propagated to Asian populations which were occupied by it from 1931 to 1945, and which officially aimed at creating a self-sufficient bloc of Asian peo ...
, with slogans such as "Asia for the Asians!", Japan sought to remove the Western powers' influence in China and replace it with Japanese domination. The ongoing conflict in China led to a deepening conflict with the US in which public opinion was alarmed by events such as the
Nanking Massacre The Nanjing Massacre (, ja, 南京大虐殺, Nankin Daigyakusatsu) or the Rape of Nanjing (formerly romanized as ''Nanking'') was the mass murder of Chinese civilians in Nanjing, the capital of the Republic of China, immediately after the ...
and growing Japanese power. Lengthy talks were held between the US and Japan. The Japanese invasion of the south of
French Indochina French Indochina (previously spelled as French Indo-China),; vi, Đông Dương thuộc Pháp, , lit. 'East Ocean under French Control; km, ឥណ្ឌូចិនបារាំង, ; th, อินโดจีนฝรั่งเศส, ...
made President
Franklin Roosevelt Franklin Delano Roosevelt (; ; January 30, 1882April 12, 1945), often referred to by his initials FDR, was an American politician and attorney who served as the 32nd president of the United States from 1933 until his death in 1945. As the ...
freeze all Japanese assets in the US. The intended consequence was to halt oil shipments from the US to Japan, which supplied 80 percent of Japanese oil imports. The Netherlands and Britain followed suit. With oil reserves that would last only a year and a half during peacetime and much less during wartime, the
ABCD line The was a Japanese name for a series of embargoes against Japan by foreign nations, including the United States of America, Britain, China, and the Dutch. It was also known as the . In 1940, in an effort to discourage Japanese militarism, thes ...
left Japan two choices: comply with the US-led demand to pull out of China or seize the oilfields in the East Indies from the Netherlands. The Japanese government deemed it unacceptable to retreat from China.


Mason-Overy debate: "Flight into War" theory

In the late 1980s, the British historian Richard Overy was involved in a historical dispute with Timothy Mason that played out mostly over the pages of the ''Past and Present'' journal over the reasons for the outbreak of the war in 1939. Mason had contended that a "flight into war" had been imposed on Hitler by a structural economic crisis, which confronted Hitler with the choice of making difficult economic decisions or aggression. Overy argued against Mason's thesis by maintaining that Germany was faced with economic problems in 1939, but the extent of those problems could not explain aggression against Poland and the reasons for the outbreak of war were the choices made by the Nazi leadership. Mason had argued that the German working-class was always against the Nazi dictatorship; that in the overheated German economy of the late 1930s, German workers could force employers to grant higher wages by leaving for another firm and so grant the desired wage increases and that such a form of political resistance forced Hitler to go to war in 1939. Thus, the outbreak of the war was caused by structural economic problems, a "flight into war" imposed by a domestic crisis. The key aspects of the crisis were, according to Mason, a shaky economic recovery that was threatened by a rearmament program that overwhelmed the economy and in which the regime's nationalist bluster limited its options. In that way, Mason articulated a ''Primat der Innenpolitik'' ("primacy of domestic politics") view of the war's origins by the concept of social imperialism. Mason's ''Primat der Innenpolitik'' thesis was in marked contrast to the ''Primat der Außenpolitik'' ("primacy of foreign politics"), which is usually used to explain the war. Mason thought German foreign policy was driven by domestic political considerations, and the launch the war in 1939 was best understood as a "barbaric variant of social imperialism". Mason argued, "Nazi Germany was always bent ''at some time'' upon a major war of expansion".#Kaillis, Kaillis, p. 165 However, Mason argued that the timing of such a war was determined by domestic political pressures, especially as relating to a failing economy, and had nothing to do with what Hitler wanted. Mason believed that from 1936 to 1941, the state of the German economy, not Hitler's "will" or "intentions", was the most important determinate on German foreign policy decisions.Kershaw, Ian (2000) ''The Nazi Dictatorship''. London: Arnold, p. 88. Mason argued that the Nazi leaders were so deeply haunted by the November 1918 German Revolution that they were most unwilling to see any fall in working-class living standards for fear of provoking a repetition of the revolution. Mason stated that by 1939, the "overheating" of the German economy caused by rearmament, the failure of various rearmament plans produced by the shortages of skilled workers, industrial unrest caused by the breakdown of German social policies and the sharp drop in living standards for the German working class forced Hitler into going to war at a time and a place that were not of his choosing.#Kaillis, Kaillis, pp. 165–166 Mason contended that when faced with the deep socio-economic crisis, the Nazi leadership had decided to embark upon a ruthless foreign policy of "smash and grab" to seize territory in Eastern Europe that could be pitilessly plundered to support the living standards in Germany. Mason described German foreign policy as driven by an opportunistic "next victim" syndrome after the ''Anschluss'' in which the "promiscuity of aggressive intentions" was nurtured by every successful foreign policy move. Mason's considered the decision to sign the
Molotov–Ribbentrop Pact , long_name = Treaty of Non-Aggression between Germany and the Union of Soviet Socialist Republics , image = Bundesarchiv Bild 183-H27337, Moskau, Stalin und Ribbentrop im Kreml.jpg , image_width = 200 , caption = Stalin and Ribbentrop shaking ...
and to attack Poland despite the risk of a war against Britain and France to be the abandonment by Hitler of his foreign policy program outlined in ''Mein Kampf'' and to have been forced on him by his need to stop a collapsing German economy by seizing territory abroad to be plundered. For Overy, the problem with Mason's thesis was that it rested on the assumption that in a way that was not shown by the records, information was passed on to Hitler about Germany's economic problems. Overy argued for a difference between economic pressures induced by the problems of the Four Year Plan and economic motives to seize raw materials, industry and foreign reserves of neighbouring states as a way of accelerating the plan. Overy asserted that Mason downplayed the repressive German state's capacity to deal with domestic unhappiness. Finally, Overy argued that there is considerable evidence that Germany felt that it could master the economic problems of rearmament. As one civil servant put it in January 1940, "we have already mastered so many difficulties in the past, that here too, if one or other raw material became extremely scarce, ways and means will always yet be found to get out of a fix".


Proximate causes


Nazi dictatorship

Hitler and his Nazis took full control of Germany in 1933–34 (Machtergreifung), turning it into a dictatorship with a highly hostile outlook toward the Treaty of Versailles and Jews. It solved its unemployment crisis by heavy military spending. Hitler's diplomatic tactics were to make seemingly-reasonable demands and to threaten war if they were not met. After concessions were made, he accepted them and moved onto a new demand. When opponents tried to appease him, he accepted the gains that were offered and went to the next target. That aggressive strategy worked as Germany pulled out of the League of Nations (1933), rejected the Versailles Treaty, began to rearm with the Anglo-German Naval Agreement (1935), won back the Saar (1935), re-militarized the Rhineland (1936), formed an alliance ("axis") with Mussolini's Italy (1936), sent massive military aid to Franco in the Spanish Civil War (1936–39), seized Austria (1938), took over Czechoslovakia after the British and French appeasement of the Munich Agreement of 1938, formed a peace pact with Stalin's Russia in August 1939 and finally invaded Poland in September 1939.


Remilitarization of the Rhineland

In violation of the Treaty of Versailles and the spirit of the Locarno Pact and the Stresa Front, Germany remilitarized the Rhineland on March 7, 1936, by moving German troops into the part of western Germany in which according to the Versailles Treaty, they were not allowed. Neither France nor Britain was prepared fight a preventive war to stop the violation and so there were no consequences.


Italian invasion of Abyssinia

Following the Stresa Front, Stresa Conference and even as a reaction to the Anglo-German Naval Agreement, the Italian dictator
Benito Mussolini Benito Amilcare Andrea Mussolini (; 29 July 188328 April 1945) was an Italian politician and journalist who founded and led the National Fascist Party. He was Prime Minister of Italy from the March on Rome in 1922 until his deposition in ...
attempted to expand the Italian Colonial Empire, Italian Empire in Africa by invading the Ethiopian Empire, also known as the Abyssinian Empire. The
League of Nations The League of Nations (french: link=no, Société des Nations ) was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 by the Paris Peace Conference th ...
declared Italy to be the aggressor and imposed sanctions on oil sales, which proved ineffective. Italy annexed Ethiopia in May 1936 and merged Ethiopia, Eritrea and Somaliland into a single colony, known as Italian East Africa. On June 30, 1936, Ethiopian Emperor Haile Selassie gave a stirring speech before the League of Nations denouncing Italy's actions and criticizing the world community for standing by. He warned, "It is us today. It will be you tomorrow". As a result of the League's condemnation of Italy, Mussolini declared the country's withdrawal from the organization.


Spanish Civil War

Between 1936 and 1939, Germany and Italy lent support to the Nationalist faction (Spanish Civil War), Nationalists led by general Francisco Franco in Spain, and the Soviet Union supported the existing democratically elected government, the Second Spanish Republic, Spanish Republic, led by Manuel Azaña. Both sides experimented with new weapons and tactics. The League of Nations was never involved, and its major powers remained neutral and tried with little success to stop arms shipments into Spain. The Nationalists eventually defeated the Republicans in 1939. Spain Meeting at Hendaye, negotiated with joining the Axis but remained neutral during World War II and did business with both sides. It also sent a Blue Division, volunteer unit to help the Germans against the Soviets. The Spanish Civil War was considered in the 1940s and 1950s to be a prelude to World War II, which was the case to some extent by changing it into an antifascist contest after 1941, but bore no resemblance to the war that started in 1939 and had no major role in causing it.


Second Sino-Japanese War

In 1931, Japan took advantage of China's weakness in the Warlord Era and fabricated the
Mukden Incident The Mukden Incident, or Manchurian Incident, known in Chinese as the 9.18 Incident (九・一八), was a false flag event staged by Japanese military personnel as a pretext for the 1931 Japanese invasion of Manchuria. On September 18, 1931, ...
in 1931 to set up the puppet state of
Manchukuo Manchukuo, officially the State of Manchuria prior to 1934 and the Empire of (Great) Manchuria after 1934, was a puppet state of the Empire of Japan in Manchuria from 1932 until 1945. It was founded as a republic in 1932 after the Japanese ...
in Manchuria, with Emperor Puyi, who had been the last emperor of China. In 1937 the Marco Polo Bridge Incident triggered the
Second Sino-Japanese War The Second Sino-Japanese War (1937–1945) or War of Resistance (Chinese term) was a military conflict that was primarily waged between the Republic of China and the Empire of Japan. The war made up the Chinese theater of the wider Pacific T ...
. The invasion was launched by the bombing of many cities such as Battle of Shanghai, Shanghai, Nanjing and Guangzhou. The latest, which began on 22 and 23 September 1937, called forth widespread protests culminating in a resolution by the Far Eastern Advisory Committee of the League of Nations. The
Imperial Japanese Army The was the official ground-based armed force of the Empire of Japan from 1868 to 1945. It was controlled by the Imperial Japanese Army General Staff Office and the Ministry of the Army, both of which were nominally subordinate to the Emper ...
captured the Chinese capital city of Nanjing and committed Japanese war crimes, war crimes in the Nanking Massacre, Nanjing Massacre. The war tied down large numbers of Chinese soldiers and so Japan set up three different Chinese puppet states to enlist some Chinese support.


Anschluss

The ''Anschluss'' was the 1938 annexation by threat of force of Austria into Germany. Historically, Pan-Germanism was the idea of creating a Greater Germany to include all ethnic Germans into one nation-state and was popular in both Austria and Germany. The National Socialist Program included the idea in one of its points: "We demand the unification of all Germans in the Greater Germany on the basis of the people's right to self-determination." The Stresa Front of 1935 between Britain, France and Italy had guaranteed the independence of Austria, but after the creation of the Axis powers, Rome-Berlin Axis, Mussolini was much less interested in upholding its independence. The Austrian government resisted as long as possible but had no outside support and finally gave in to Hitler's fiery demands. No fighting occurred, most Austrians supported the annexation and Austria was fully absorbed as part of Germany. Outside powers did nothing, and Italy had little reason for continued opposition to Germany and, if anything, was drawn in closer to the Nazis.Faber, David (2010) ''Munich, 1938: Appeasement and World War II''. pp. 139–68.


Munich Agreement

The
Sudetenland The Sudetenland ( , ; Czech and sk, Sudety) is the historical German name for the northern, southern, and western areas of former Czechoslovakia which were inhabited primarily by Sudeten Germans. These German speakers had predominated in the ...
was a predominantly-German region in Czechoslovakia along the border with Germany. It had more than three million ethnic Germans, who comprised almost a quarter of the country's population. In the
Treaty of Versailles The Treaty of Versailles (french: Traité de Versailles; german: Versailler Vertrag, ) was the most important of the peace treaties of World War I. It ended the state of war between Germany and the Allied Powers. It was signed on 28 June 1 ...
, the region was given to the Czechoslovakia against the wishes of most of the local population. The decision to disregard its right to self-determination was based on France's intent to weaken Germany. Much of Sudetenland was industrialised. Czechoslovakia had a modern army of 38 divisions, backed by a well-noted armament industry (Škoda Works, Škoda) and military alliances with France and the Soviet Union. However, its defensive strategy against Germany was based on the mountains of the Sudetenland. Hitler pressed for the Sudetenland's incorporation into Germany and supported German separatist groups within the region. Alleged Czechoslovak brutality and persecution under Prague helped to stir up nationalist tendencies, as did the Nazi press. After the ''Anschluss'', all German parties except for the German Social-Democratic Party merged with the Sudeten German Party (SdP). Paramilitary activity and extremist violence peaked during the period, and the Czechoslovak government declared martial law in parts of the Sudetenland to maintain order. That only complicated the situation, especially since Slovak nationalism was rising from suspicion towards Prague and encouragement by Germany. Citing the need to protect the Germans in Czechoslovakia, Germany requested the immediate annexation of the Sudetenland. In the Munich Agreement on September 30, 1938, the British, French, and Italian prime ministers appeased Hitler by giving him what he wanted in the hope that it would be his last demand. The powers allowed Germany to move troops into the region and incorporate it into the Reich "for the sake of peace". In exchange, Hitler gave his word that Germany would make no further territorial claims in Europe. Czechoslovakia was not allowed to participate in the conference. When the French and British negotiators informed the Czechoslovak representatives about the agreement and that if Czechoslovakia would not accept it, France and Britain would consider Czechoslovakia to be responsible for war and stay neutral, Czechoslovak President Edvard Beneš capitulated and Germany took the Sudetenland unopposed. Chamberlain's policies have been the subject of intense debate for more than 70 years by academics, politicians and diplomats. The historians' assessments have ranged from condemnation for allowing Hitler's Germany to grow too strong to the judgment that Germany was so strong that it might well win a war and so the postponement of a showdown was in the country's best interests.


German occupation and Slovak independence

In March 1939, breaking the Munich Agreement, German troops invaded Prague, and with the Slovaks declaring independence, Czechoslovakia disappeared as a country. The entire ordeal ended the French and British policy of appeasement.


Italian invasion of Albania

After the German occupation of Czechoslovakia, Mussolini feared for Italy becoming a second-rate member of the Axis. Rome delivered Tirana an ultimatum on March 25, 1939, by demanding the accession to Italy's occupation of Albania. King Zog refused to accept money in exchange for allowing a full Italian takeover and colonization of Albania. On April 7, 1939, Italian troops invaded Albania, which was occupied after a three-day campaign with minimal resistance offered by Albanian forces.


Soviet–Japanese border war

In 1939, the Japanese attacked west from Manchuria into the Mongolian People's Republic after the 1938 Battle of Lake Khasan. They were decisively beaten by Soviet units, under General Georgy Zhukov. After the battle, the Soviet Union and Japan were at peace until 1945. Japan looked south to expand its empire, which led to conflict with the United States over the Philippines and the control of shipping lanes to the Dutch East Indies. The Soviet Union focused on its western border but left 1 million to 1.5 million troops to guard its border with Japan.


Danzig crisis

After the end of Czechoslovakia proved that Germany could not be trusted, Britain and France decided on a change of strategy. They decided any further unilateral German expansion would be met by force. The natural next target for German expansion was Poland, whose Polish Corridor, access to the Baltic sea had been carved out of West Prussia by the Versailles Treaty, which made East Prussia an exclave. The main port of the area, Danzig, had been made into a Free City of Danzig (interwar), free city-state under Polish influence guaranteed by the League of Nations, a stark reminder to German nationalists of the Free City of Danzig (Napoleonic), Napoleonic free city that had been established after French Emperor Napoleon I's crushing victory over Prussia in 1807. After taking power, the Nazi government made efforts to establish friendly relations with Poland, which resulted in the signing of the ten-year German–Polish Non-Aggression Pact with the Piłsudski regime in 1934. In 1938, Poland participated in the dismemberment of Czechoslovakia by annexing Zaolzie. In 1939, Hitler claimed extraterritoriality for the Reichsautobahn Berlin-Königsberg and a change in Danzig's status in exchange for promises of territory in Poland's neighbours and a 25-year extension of the non-aggression pact. Poland refused for fear of losing its ''de facto'' access to the sea, subjugation as a German satellite, satellite state or client state and future further German demands. In August 1939, Hitler delivered an ultimatum to Poland on Danzig's status.


Polish alliance with Entente

In March 1939, Britain and France guaranteed the independence of Poland. Hitler's claims in the summer of 1939 on Danzig and the Polish Corridor provoked yet another international crisis. On August 25, Britain signed the Polish-British Common Defence Pact.


Molotov–Ribbentrop Pact

Nominally, the
Molotov–Ribbentrop Pact , long_name = Treaty of Non-Aggression between Germany and the Union of Soviet Socialist Republics , image = Bundesarchiv Bild 183-H27337, Moskau, Stalin und Ribbentrop im Kreml.jpg , image_width = 200 , caption = Stalin and Ribbentrop shaking ...
was a non-aggression treaty between Germany and the Soviet Union and was signed in Moscow on August 23, 1939, by Soviet Foreign Minister Vyacheslav Molotov and German Foreign Minister Joachim von Ribbentrop. In 1939, neither Germany nor the Soviet Union was ready to go to war with each other. The Soviet Union had lost territory to Poland in 1920. Although officially called a "non-aggression treaty," the pact included a secret protocol in which the independent countries of Finland, Estonia, Latvia, Lithuania, Poland and Romania were divided into spheres of interest between both the parties. The secret protocol explicitly assumed "territorial and political rearrangements" in those areas. All of the mentioned countries were invaded, occupied, or forced to cede part of their territory by the Soviet Union, Germany or both. Finland and Romania maintained their independence, however being forced to cede parts of their territory. The conflict between the Soviet Union and Finland had a great impact of assessing the former's military capabilities by Nazi Germany.


Declarations of war


Invasion of Poland

Between 1919 and 1939, Poland had pursued a policy of balancing between the Soviet Union and Nazi Germany and agreed to non-aggression pacts with both. In early 1939, Germany demanded for Poland to join the Anti-Comintern Pact as a satellite state of Germany. Poland, fearing a loss of independence, refused. Hitler admitted to his generals on 23 May 1939 that his reason for invading Poland was not Danzig: "Danzig is not the issue at stake. It is a matter of extending our Lebensraum, living space in the East...". To deter Hitler, Britain and France announced that an invasion would mean war and tried to convince the Soviet Union to join in this deterrence. The Soviets, however, gained control of the Baltic states and part of Poland by allying with Germany by the secret
Molotov–Ribbentrop Pact , long_name = Treaty of Non-Aggression between Germany and the Union of Soviet Socialist Republics , image = Bundesarchiv Bild 183-H27337, Moskau, Stalin und Ribbentrop im Kreml.jpg , image_width = 200 , caption = Stalin and Ribbentrop shaking ...
in August 1939. London's attempt at deterrence failed, but Hitler did not expect a wider war. Germany invaded Poland on September 1, 1939, and rejected the British and French demands for it to withdraw, which resulted in both to declare war on September 3, 1939, in accordance with the defence treaties with Poland that they had signed and publicly announced. However neither France nor Britain provided significant military aid to Poland except small operation known as Saar offensive. As of 1 September 1939 Poland was only partially mobilized, which was largely the result of pressure from the British and French ambassadors on the Polish government, fearing a repeat of the mobilization scenario of war from 1914. The Wehrmacht also had advantage in terms of the number of tanks and planes and the technical advancement of its equipment. On September 17, 1939, the Red Army entered Poland from the east, and the Polish Command decided to abandon the defense of the so-called Romanian Bridgehead and evacuate of all its forces to neighboring countries. The last larger unit of Polish troops capitulated on October 6, 1939, near Kock, but some units went straight to partisan combat. Until the spring of 1940, the resistance of irregular units in the region of the Świętokrzyskie Mountains in central Poland lasted, but the struggle of these units resulted in enormous repressions against the civilian population of the region in which they operated


Invasion of Soviet Union

Germany attacked the Soviet Union in June 1941. Hitler believed that the Soviet Union could be defeated in a fast and relentless assault that capitalised on the Soviets' ill-prepared state and hoped that success there would bring Britain to the negotiation table, which would end the war altogether.


Attacks on Pearl Harbor, the Philippines, British Malaya, Singapore and Hong Kong

The US government and general public in general had been supportive of China, condemned European century of humiliation, colonialist policies and Japan and promoted the so-called Open Door Policy. Many Americans viewed the Japanese as an aggressive and/or inferior race. The Nationalist government of Chiang Kai-shek held friendly relations with the US, which opposed Japan's invasion of China in 1937 and considered it a violation of international law and of the sovereignty of the Republic of China (1912-1949), Republic of China. The US offered the Nationalist government diplomatic, economic and military assistance during its war against Japan. Diplomatic friction between the United States and Japan manifested itself in events like the Panay incident in 1937 and the Allison incident in 1938. Reacting to Japanese pressure on French authorities of French Indochina to stop trade with China, the US began restricting trade with Japan in July 1940. The end of all oil shipments in 1941 was decisive since the Americans, British and Dutch provided almost all of Japan's oil. In September 1940, the Japanese invasion of French Indochina, Japanese invaded Vichy French Indochina and occupied Tonkin to prevent China from importing arms and fuel through French Indochina along the Sino-Vietnamese Railway from the port of Haiphong through Hanoi to Kunming, in Yunnan. The US decided that the Japanese had now gone too far and decided to force a rollback of its gains. In 1940 and 1941, the Americans and the Chinese decided to organise a volunteer squadron of American planes and pilots to attack the Japanese from Chinese bases. Known as the Flying Tigers, the unit was commanded by Claire Lee Chennault. Its first combat came two weeks after the attack on Pearl Harbor. Taking advantage of the situation, Thailand launched the Franco-Thai War in October 1940. Japan stepped in as a mediator in the war in May 1941 and allowed its ally to occupy the bordering provinces in Cambodia and Laos. In July 1941, as Operation Barbarossa had effectively neutralised the Soviet threat, the faction of the Japanese military junta supporting the "Southern Strategy" pushed through the occupation of the rest of French Indochina. The US reacted by seeking to bring the Japanese war effort to a complete halt by imposing a ABCD line, full embargo on all trade between the United States to Japan on August 18, 1941, and demanding a Japanese withdrawal of all troops from China and Indochina. Japan was dependent on the United States for 80% of its oil, which resulted in an economic and military crisis for Japan since it could not continue the war effort against China without access to petroleum and oil products. On 7 December 1941, without a declaration of war, the
Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, when it was dissolved following Japan's surrender ...
attacked Pearl Harbor with the aim of destroying the United States Pacific Fleet, main American battle fleet at anchor. Meanwhile, other Pacific War#South-East Asian campaigns of 1941–42, Japanese forces attacked the American-held Commonwealth of the Philippines, Philippines and the British Empire in British Malaya, Malaya, Singapore, and Hong Kong. The following day, an official Japanese declaration of war on the United States and the British Empire was printed on the front page of all Japanese newspapers' evening editions. International time differences caused the announcement to take place between midnight and 3 a.m. on 8 December in North America and at about 8 a.m. on 8 December in the United Kingdom. Canada declared war on Japan on the evening of 7 December, and a royal proclamation affirmed the declaration the next day. The United Kingdom declaration of war on Japan (1941), British declared war on Japan on the morning of 8 December and specifically identified the attacks on Malaya, Singapore and Hong Kong as the cause but omitted any mention of Pearl Harbor. The United States declaration of war on Japan, United States declared war upon Japan on the afternoon of 8 December, nine hours after the United Kingdom, and identified only "unprovoked acts of war against the Government and the people of the United States of America" as the cause. Four days later, the US was brought into the European war when Consequences of the attack on Pearl Harbor#Germany and Italy declare war, on December 11, 1941, Nazi Germany and Fascist Italy declared war on the United States. Hitler chose to declare that the Tripartite Pact required Germany to follow Japan's declaration of war although American destroyers escorting convoys and German U-boats had been ''de facto'' at war in the Battle of the Atlantic. The declaration of war effectively ended United States non-interventionism#Non-interventionism before entering World War II, US isolationist sentiment, and the country immediately reciprocated and so formally entered the war in Europe.See also United States declaration of war upon Italy and United States declaration of war upon Germany (1941).


See also

* 1930s * Areas annexed by Nazi Germany * Diplomatic history of World War II * European Civil War * European interwar economy * International relations (1919–1939) * Interwar Britain *
Interwar period In the history of the 20th century, the interwar period lasted from 11 November 1918 to 1 September 1939 (20 years, 9 months, 21 days), the end of the First World War to the beginning of the Second World War. The interwar period was relative ...
, worldwide * Neville Chamberlain's European Policy * Timeline of events preceding World War II ** Events preceding World War II in Asia ** Events preceding World War II in Europe * *


References


Cited sources

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External links


France, Germany and the Struggle for the War-making Natural Resources of the Rhineland
��Explains the long term conflict between Germany and France over the centuries, which was a contributing factor to the World Wars.



{{DEFAULTSORT:Causes Of World War Ii Causes of wars, World War II, Causes of Chronology of World War II Politics of World War II