The Allies of World War II were a group of countries that together opposed the Axis powers during the
Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a global war A world war is "a war War is an intense armed conflict between states State may refer to: Arts, entertainment, and media Literatur ...
(1939–1945). The Allies promoted the alliance as a means to defeat
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 ...

Nazi Germany
, the
Empire of Japan The was a historical nation-state A nation state is a political unit where the state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of Sta ...

Empire of Japan
, Fascist Italy and their allies. At the start of the war on 1 September 1939, the Allies consisted of
Poland Poland, officially the Republic of Poland, is a country located in Central Europe. It is divided into 16 Voivodeships of Poland, administrative provinces, covering an area of , and has a largely Temperate climate, temperate seasonal cli ...
, the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usage is mixed. The Guardian' and Telegraph' use Britain as a synonym for the United Kingdom. Some prefer to use Britain as shorth ...

United Kingdom
, and
France France (), officially the French Republic (french: link=no, République française), is a transcontinental country This is a list of countries located on more than one continent A continent is one of several large landmasses ...
as well as their dependent states, such as
British India The Provinces of India, earlier Presidencies of British India and still earlier, Presidency towns, were the administrative divisions of British governance in the Indian subcontinent. Collectively, they have been called British India. In one ...

British India
. They were joined by the independent
Dominion The term dominion was used to refer to one of several self-governing nations of the British Empire The British Empire was composed of the dominions, Crown colony, colonies, protectorates, League of Nations mandate, mandates, and other D ...

s of the
British Commonwealth The Commonwealth of Nations, generally known simply as the Commonwealth, is a political association of 54 member states, almost all of which are former territories A territory is an administrative division, usually an area that is under the ...

British Commonwealth
Canada Canada is a country in the northern part of North America North America is a continent A continent is any of several large landmasses. Generally identified by convention (norm), convention rather than any strict criteria, ...

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

New Zealand New Zealand ( mi, Aotearoa ''Aotearoa'' (; commonly pronounced by English English usually refers to: * English language English is a West Germanic languages, West Germanic language first spoken in History of Anglo-Saxon Engl ...
South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. With over 60 million people, it is the world's 23rd-most populous nation and covers an area of . South Africa has three capital citie ...
. After the start of the German invasion of North Europe until the Balkan Campaign, the
Netherlands ) , national_anthem = ( en, "William of Nassau") , image_map = EU-Netherlands.svg , map_caption = , image_map2 = BES islands location map.svg , map_caption2 = , image_map3 ...

Belgium Belgium ( nl, België ; french: Belgique ; german: Belgien ), officially the Kingdom of Belgium, is a country in Western Europe Western Europe is the western region of Europe. The region's countries and territories vary depending on cont ...

Greece Greece ( el, Ελλάδα, Elláda, ), officially the Hellenic Republic, is a country located in Southeastern Europe Southeast Europe or Southeastern Europe () is a geographical subregion A subregion is a part of a larger region In geogr ...
, and
Yugoslavia Yugoslavia (; sh, Jugoslavija / ; sl, Jugoslavija ; mk, Југославија ;; rup, Iugoslavia; hu, Jugoszlávia; Pannonian Rusyn Image:Novi Sad mayor office.jpg, 250px, Mayor office written in four official languages used in the ...
joined the Allies. After first having cooperated with Germany in invading Poland whilst remaining neutral in the Allied-Axis conflict, the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a that spanned during its existence from 1922 to 1991. It was nominally a of multiple national ; in practice and were highly until its final years. The ...
perforce joined the Allies in June 1941 after being
invaded by Germany
invaded by Germany
. The
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...

United States
provided war
materiel Materiel or matériel (; ) refers to supplies, equipmentEquipment most commonly refers to a set of tool A tool is an object that can extend an individual's ability to modify features of the surrounding environment. Although many animals u ...
and money to the Allies all along, and officially joined in December 1941 after the Japanese
attack on Pearl Harbor The Attack on Pearl HarborAlso known as the Battle of Pearl Harbor was a surprise military strike In the United States Armed Forces, military of the United States, strikes and raids are a group of military operations that, alongside quite ...

attack on Pearl Harbor
China China (), officially the People's Republic of China (PRC; ), is a country in East Asia East Asia is the eastern region of Asia Asia () is Earth's largest and most populous continent, located primarily in the Eastern Hemisphere ...
had already been in a prolonged war with Japan since the
Marco Polo Bridge Incident The Marco Polo Bridge Incident, also known as the Lugou Bridge Incident () or the Double-Seven Incident (), was a July 1937 battle between Republic of China (1912–1949), China's National Revolutionary Army and the Imperial Japanese Army. Si ...
of 1937 and officially joined the Allies in December 1941. The Big Three—the United Kingdom, the Soviet Union, and the United States—formed a Grand Alliance that was key to victory. They controlled Allied strategy; relations between the United Kingdom and the United States were especially close. The alliance was formalized by the
Declaration by United Nations The Declaration by United Nations was the main treaty that formalized the Allies of World War II and was signed by 47 national governments between 1942 and 1945. On New Year's Day 1942, during the Arcadia Conference, the Allied "Four Policemen, Bi ...
, on 1 January 1942. The Big Three together with China were referred to as a "
trustee Trustee (or the holding of a trusteeship) is a legal term {{Short pages monitor * Liberia: 27 January 1944 * Kingdom of Romania, Romania: 25 August 1944—former Axis power * Kingdom of Bulgaria, Bulgaria: 8 September 1944—former Axis power


* Ecuador: 2 February 1945 * Paraguay: 7 February 1945 * Uruguay: 15 February 1945 * United States of Venezuela, Venezuela: 15 February 1945 * Turkey: 23 February 1945 * Kingdom of Egypt, Egypt: 24 February 1945 * Mandatory Syrian Republic, Syria: 26 February 1945 * Lebanon: 27 February 1945 * Saudi Arabia: 1 March 1945 * Finland: 3 March 1945—former co-belligerent of Germany in the Continuation War. On 3 March 1945, Finland retroactively declared war on Germany from 15 September 1944. * Argentina: 27 March 1945Decree 6945/45 * Presidential Republic (1925–73), Chile: 11 April 1945 declared war on Japan * Mongolian People's Republic, Mongolia: August 1945 declared war on Japan

See also

* Allied leaders of World War II *Diplomatic history of World War II * Free World (World War II) * Military production during World War II * Participants in World War II



* *Norman Davies, Davies, Norman (2006), ''Europe at War 1939–1945: No Simple Victory''. London: Macmillan. * Dear, Ian C. B. and Michael Foot, eds. ''The Oxford Companion to World War II'' (2005), comprehensive encyclopedia for all countries * Holland R. (1981), ''Britain and the Commonwealth alliance, 1918–1939'', London: Macmillan. * Richard Overy, Overy, Richard (1997), ''Russia's War: A History of the Soviet Effort: 1941–1945''. New York: Penguin. . * Weinberg, Gerhard L. (1994). ''A World at Arms: A Global History of World War II''. Comprehensive coverage of the war with emphasis on diplomac
excerpt and text search

Further reading


External links

The Atlantic Conference: Resolution of 24 September 1941
{{Authority control 20th-century military alliances Military alliances involving Canada Military alliances involving the United Kingdom Military alliances involving the United States Military alliances involving Australia Military alliances involving New Zealand Military alliances involving South Africa Military alliances involving France Politics of World War II History of diplomacy