Polish population transfers (1944–1946)
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The Polish population transfers in 1944–1946 from the eastern half of prewar Poland (also known as the expulsions of Poles from the Kresy macroregion), were the forced migrations of
Poles Poles,, ; singular masculine: ''Polak'', singular feminine: ''Polka'' or Polish people, are a West Slavic nation and ethnic group, who share a common history, culture, the Polish language and are identified with the country of Poland in Ce ...
toward the end and in the aftermath of World War II. These were the result of Soviet policy that was ratified by 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 ...
. Similarly, the Soviet Union had enforced policies between 1939 and 1941 which targeted and expelled ethnic Poles residing in the Soviet zone of occupation following the Nazi-Soviet invasion of Poland. The second wave of expulsions resulted from the retaking of Poland by the Red Army during the Soviet counter-offensive. It took over territory for its republic of Ukraine, a shift that was ratified at the end of World War II by the Soviet Union's then Allies of the West. The postwar population transfers, targeting Polish nationals, were part of an official Soviet policy that affected more than one million Polish citizens, who were removed in stages from the Polish areas annexed by the Soviet Union. After the war, following Soviet demands laid out during the Tehran Conference of 1943, the Kresy macroregion was formally incorporated into the Ukrainian, Belarusian and Lithuanian
Republics of the Soviet Union The Republics of the Union of Soviet Socialist Republics or the Union Republics ( rus, Сою́зные Респу́блики, r=Soyúznye Respúbliki) were National delimitation in the Soviet Union, national-based administrative units of ...
. This was agreed at the Potsdam Conference of Allies in 1945, to which the acting Government of the Republic of Poland in exile was not invited. The ethnic
displacement Displacement may refer to: Physical sciences Mathematics and Physics *Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...
of Poles (and also of ethnic Germans) was agreed to by the Allied leaders:
Winston Churchill Sir Winston Leonard Spencer Churchill (30 November 187424 January 1965) was a British statesman, soldier, and writer who served as Prime Minister of the United Kingdom twice, from 1940 to 1945 Winston Churchill in the Second World War, dur ...
of the United Kingdom, Franklin D. Roosevelt of the U.S., and Joseph Stalin of the USSR, during the conferences at both Tehran and Yalta. The Polish transfers were among the largest of several post-war expulsions in
Central Central is an adjective usually referring to being in the center of some place or (mathematical) object. Central may also refer to: Directions and generalised locations * Central Africa, a region in the centre of Africa continent, also known as ...
and Eastern Europe, which displaced a total of about 20 million people. According to official data, during the state-controlled expulsion between 1945 and 1946, roughly 1,167,000 Poles left the westernmost republics of the Soviet Union, less than 50% of those who registered for population transfer. Another major ethnic Polish transfer took place after Stalin's death, in 19551959. The process is variously known as expulsion, deportation, depatriation, or repatriation, depending on the context and the source. The term ''repatriation'', used officially in both communist-controlled Poland and the USSR, was a deliberate distortion, as deported peoples were leaving their homeland rather than returning to it. It is also sometimes referred to as the 'first repatriation' action, in contrast with the ' second repatriation' of 19551959. In a wider context, it is sometimes described as a culmination of a process of "de-Polonization" of the areas during and after the world war. The process was planned and carried out by the communist regimes of the USSR and of post-war Poland. Many of the deported Poles were settled in formerly German eastern provinces; after 1945, these were referred to as the " Recovered Territories" of the
People's Republic of Poland The Polish People's Republic ( pl, Polska Rzeczpospolita Ludowa, PRL) was a country in Central Europe that existed from 1947 to 1989 as the predecessor of the modern Republic of Poland. With a population of approximately 37.9 million nea ...
.


Background

The history of ethnic Polish settlement in what is now Ukraine and Belarus dates to 1030–31. More Poles migrated to this area after the Union of Lublin in 1569, when most of the territory became part of the newly established Polish–Lithuanian Commonwealth. From 1657 to 1793, some 80 Roman Catholic churches and monasteries were built in Volhynia alone. The expansion of Catholicism in Lemkivshchyna, Chełm Land, Podlaskie, Brześć land,
Galicia Galicia may refer to: Geographic regions * Galicia (Spain), a region and autonomous community of northwestern Spain ** Gallaecia, a Roman province ** The post-Roman Kingdom of the Suebi, also called the Kingdom of Gallaecia ** The medieval King ...
, Volhynia and
Right bank Ukraine Right-bank Ukraine ( uk , Правобережна Україна, ''Pravoberezhna Ukrayina''; russian: Правобережная Украина, ''Pravoberezhnaya Ukraina''; pl, Prawobrzeżna Ukraina, sk, Pravobrežná Ukrajina, hu, Jobb p ...
was accompanied by the process of gradual Polonization of the eastern lands. Social and ethnic conflicts arose regarding the differences in religious practices between the Roman Catholic and the Eastern Orthodox adherents during the Union of Brest in 1595-96, when the Metropolitan of Kiev-Halych broke relations with the Eastern Orthodox Church and accepted the authority of the Roman Catholic Pope and Vatican. The
partitions of Poland The Partitions of Poland were three partitions of the Polish–Lithuanian Commonwealth that took place toward the end of the 18th century and ended the existence of the state, resulting in the elimination of sovereign Poland and Lithuania for 12 ...
, toward the end of the 18th century, resulted in the expulsions of ethnic Poles from their homes in the east for the first time in the history of the nation. Some 80,000 Poles were escorted to Siberia by the Russian imperial army in 1864 in the single largest deportation action undertaken within the Russian Partition. "Books were burned; churches destroyed; priests murdered;" wrote
Norman Davies Ivor Norman Richard Davies (born 8 June 1939) is a Welsh-Polish historian, known for his publications on the history of Europe, Poland and the United Kingdom. He has a special interest in Central and Eastern Europe and is UNESCO Professor at ...
. Meanwhile, Ukrainians were officially considered "part of the
Russian people , native_name_lang = ru , image = , caption = , population = , popplace = 118 million Russians in the Russian Federation (2002 ''Winkler Prins'' estimate) , region1 = , pop1 ...
". The Russian Revolution of 1917 and the Russian Civil War of 1917-1922 brought an end to the Russian Empire.Goldstein, Erik (1992). ''Second World War 1939–1945''. Wars and Peace Treaties. London: Routledge. . According to Ukrainian sources from the
Cold War The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because the ...
period, during the Bolshevik revolution of 1917 the Polish population of
Kiev Kyiv, also spelled Kiev, is the capital and most populous city of Ukraine. It is in north-central Ukraine along the Dnieper, Dnieper River. As of 1 January 2021, its population was 2,962,180, making Kyiv the List of European cities by populat ...
was 42,800. In July 1917, when relations between the Ukrainian People's Republic (UNR) and Russia became strained, the Polish Democratic Council of Kiev supported the Ukrainian side in its conflict with
Petrograd Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), i ...
. Throughout the existence of UNR (1917–21), there was a separate ministry for Polish affairs, headed by Mieczysław Mickiewicz; it was set up by the Ukrainian side in November 1917. In that entire period, some 1,300 Polish-language schools were operating in Galicia, with 1,800 teachers and 84,000 students. In the region of Podolia in 1917, there were 290 Polish schools. Beginning in 1920, the Bolshevik and nationalist terror campaigns of the new war triggered the flight of Poles and Jews from Soviet Russia to newly sovereign Poland. In 1922 Bolshevik Russian Red Army, with their Bolshevik allies in Ukraine overwhelmed the government of the Ukrainian People's Republic, including the annexed Ukrainian territories into the Soviet Union. In that year, 120,000 Poles stranded in the east were expelled to the west and the
Second Polish Republic The Second Polish Republic, at the time officially known as the Republic of Poland, was a country in Central Europe, Central and Eastern Europe that existed between 1918 and 1939. The state was established on 6 November 1918, before the end of ...
. The Soviet census of 1926 recorded ethnic Poles as being of Russian or Ukrainian ethnicity, reducing their apparent numbers in Ukraine. In the autumn of 1935, Stalin ordered a new wave of mass deportations of Poles from the western republics of the Soviet Union. This was also the time of his purges of different classes of people, many of whom were killed. Poles were expelled from the border regions in order to resettle the area with ethnic Russians and Ukrainians, but Stalin had them deported to the far reaches of Siberia and Central Asia. In 1935 alone 1,500 families were deported to Siberia from Soviet Ukraine. In 1936, 5,000 Polish families were deported to Kazakhstan. The deportations were accompanied by the gradual elimination of Polish cultural institutions. Polish-language newspapers were closed, as were Polish-language classes throughout Ukraine. Soon after the wave of deportations, the Soviet NKVD orchestrated the Genocide of Poles in the Soviet Union. The Polish population in the USSR had officially dropped by 165,000 in that period according to the official Soviet census of 1937–38; Polish population in the Ukrainian SSR decreased by about 30%.


Second Polish Republic

Amidst several border conflicts, Poland re-emerged as a sovereign state in 1918 following
Partitions of Poland The Partitions of Poland were three partitions of the Polish–Lithuanian Commonwealth that took place toward the end of the 18th century and ended the existence of the state, resulting in the elimination of sovereign Poland and Lithuania for 12 ...
. The Polish-Ukrainian alliance was unsuccessful, and the Polish-Soviet war continued until the Treaty of Riga was signed in 1921. The Soviet Union did not officially exist before 31 December 1922.See for instanc
Russo-Polish War
in Encyclopædia Britannica
"The conflict began when the Polish head of state Józef Piłsudski formed an alliance with the Ukrainian nationalist leader Symon Petlyura (21 April 1920) and their combined forces began to overrun Ukraine, occupying Kiev on 7 May."
The disputed territories were split in Riga between the
Second Polish Republic The Second Polish Republic, at the time officially known as the Republic of Poland, was a country in Central Europe, Central and Eastern Europe that existed between 1918 and 1939. The state was established on 6 November 1918, before the end of ...
and the Soviet Union representing Ukrainian SSR (part of the Soviet Union after 1923). In the following few years in Kresy, the lands assigned to sovereign Poland, some 8,265 Polish farmers were resettled with help from the government. The overall number of settlers in the east was negligible as compared to the region's long-term residents. For instance in the Volhynian Voivodeship (1,437,569 inhabitants in 1921), the number of settlers did not exceed 15,000 people (3,128 refugees from
Bolshevist Russia The Russian Soviet Federative Socialist Republic, Russian SFSR or RSFSR ( rus, Российская Советская Федеративная Социалистическая Республика, Rossíyskaya Sovétskaya Federatívnaya Soci ...
, roughly 7,000 members of local administration, and 2,600 military settlers). Approximately 4 percent of the newly arrived settlers lived on land granted to them. The majority either rented their land to local farmers, or moved to the cities. Tensions between the
Ukrainian minority in Poland Ukrainians in Poland have various legal statuses: ethnic minority, temporary and permanent residents, and refugees. According to the Polish census of 2011, the Ukrainian minority in Poland was composed of approximately 51,000 people (including ...
and the Polish government escalated. On 12 July 1930, activists of the Organization of Ukrainian Nationalists (OUN), helped by the UVO, began the so-called ''sabotage action'', during which Polish estates were burned, and roads, rail lines and telephone connections were destroyed. The OUN used terrorism and sabotage in order to force the Polish government into actions that would cause a loss of support for the more moderate Ukrainian politicians ready to negotiate with the Polish state.''Eastern Europe in the Twentieth Century''
, By R. J. Crampton, page 50
OUN directed its violence not only against the Poles but also against Jews and other Ukrainians who wished for a peaceful resolution to the Polish–Ukrainian conflict.''Galicia''
, By C. M. Hann and Paul R. Magocsi, page 148


Invasion of Poland

The 1939 Soviet invasion of Poland during World War II was subsequently accompanied by the Soviets forcibly deporting hundreds of thousands of Polish citizens to distant parts of the Soviet Union: Siberia and Central Asia. Five years later, for the first time, the Supreme Soviet formally acknowledged that the Polish nationals expelled after the Soviet invasion were not Soviet citizens, but foreign subjects. Two decrees were signed on 22 June and 16 August 1944 to facilitate the release of Polish nationals from captivity.


Deportations

After the signing of the secret Molotov-Ribbentrop pact in 1939 between Nazi Germany and the Soviet Union, Germany
invaded An invasion is a military offensive in which large numbers of combatants of one geopolitical entity aggressively enter territory owned by another such entity, generally with the objective of either: conquering; liberating or re-establishing con ...
Western Poland. Two weeks later, the Soviet Union invaded eastern Poland. As a result, Poland was divided between the Germans and the Soviets (see Polish areas annexed by the Soviet Union). With the annexation of the Kresy in 1939, modern-day Western Ukraine was annexed to Soviet Ukraine, and Western Belarus to
Soviet Belorussia The Byelorussian Soviet Socialist Republic (BSSR, or Byelorussian SSR; be, Беларуская Савецкая Сацыялістычная Рэспубліка, Bielaruskaja Savieckaja Sacyjalistyčnaja Respublika; russian: Белор ...
, respectively. Spreading terror throughout the region, the Soviet secret police (NKVD) accompanying the Red Army murdered
Polish prisoners of war Polish may refer to: * Anything from or related to Poland, a country in Europe * Polish language * Poles, people from Poland or of Polish descent * Polish chicken *Polish brothers (Mark Polish and Michael Polish, born 1970), American twin screenwr ...
. Polish Institute of National Remembrance. Internet Archive, 16.10.03. Retrieved 16 July 2007. From 1939 to 1941 the Soviets also forcibly deported specific social groups deemed "untrustworthy" to forced labor facilities in Kazakhstan and Siberia. Many children, elderly and sick died during the journeys in cargo trains which lasted weeks. Whereas the Polish government-in-exile put the number of deported Polish citizens at 1,500,000 and some Polish estimates reached 1,600,000 to 1,800,000 persons, historians consider these evaluations as exaggerated. Alexander Guryanov calculated that 309,000 up to 312,000 Poles were deported from February 1940 to June 1941. According to N.S. Lebedeva the deportations involved about 250,000 persons. The most conservative Polish counts based on Soviet documents and published by the Main Commission to Investigate Crimes Against the Polish Nation in 1997 amounted to a grand total of 320,000 persons deported. Sociologist Tadeusz Piotrowski argues that various other smaller deportations, prisoners of war and political prisoners should be added for a grand total of 400,000 to 500,000 deported. By 1944, the population of ethnic Poles in Western Ukraine was 1,182,100. The
Polish government in exile The Polish government-in-exile, officially known as the Government of the Republic of Poland in exile ( pl, Rząd Rzeczypospolitej Polskiej na uchodźstwie), was the government in exile of Poland formed in the aftermath of the Invasion of Pola ...
in London affirmed its position of retaining the 1939 borders. Nikita Khrushchev, however, approached Stalin personally to keep the territories gained through the illegal and secret Molotov-Ribbentrop pact under continued Soviet occupation. The document regarding the resettlement of Poles from the Ukrainian and Belorussian SSRs to Poland was signed 9 September 1944 in
Lublin Lublin is the ninth-largest city in Poland and the second-largest city of historical Lesser Poland. It is the capital and the center of Lublin Voivodeship with a population of 336,339 (December 2021). Lublin is the largest Polish city east of t ...
by Khrushchev and the head of the Polish Committee of National Liberation Edward Osóbka-Morawski (the corresponding document with the Lithuanian SSR was signed on 22 September). The document specified who was eligible for the resettlement (it primarily applied to all Poles and Jews who were citizens of the
Second Polish Republic The Second Polish Republic, at the time officially known as the Republic of Poland, was a country in Central Europe, Central and Eastern Europe that existed between 1918 and 1939. The state was established on 6 November 1918, before the end of ...
before 17 September 1939, and their families), what property they could take with them, and what aid they would receive from the corresponding governments. The resettlement was divided into two phases: first, the eligible citizens were registered as wishing to be resettled; second, their request was to be reviewed and approved by the corresponding governments. About 750,000 Poles and Jews from the western regions of Ukraine were deported, as well as about 200,000 each from western Belarus and from Lithuanian SSR each. The deportations continued until August 1, 1946.


Postwar transfers from Ukraine

Toward the end of World War II, tensions between the Polish AK and Ukrainians escalated into the
Massacres of Poles in Volhynia The massacres of Poles in Volhynia and Eastern Galicia ( pl, rzeź wołyńska, lit=Volhynian slaughter; uk, Волинська трагедія, lit=Volyn tragedy, translit=Volynska trahediia), were carried out in German-occupied Poland by the ...
, led by the nationalist Ukrainian groups including the Organization of Ukrainian Nationalists (OUN) and the Ukrainian Insurgent Army. Although the Soviet government was trying to eradicate these organizations, it did little to support the Polish minority; and instead encouraged population transfer. The haste at which repatriation was done was such that the Polish leader Bolesław Bierut was forced to intercede and approach Stalin to slow down the deportation, as the post-war Polish government was overwhelmed by the sudden great number of refugees needing aid. The Poles in southern Kresy (now Western Ukraine) were given the option of resettlement in Siberia or Poland, and most chose Poland. The Polish government-in-exile in London directed their organizations (see Polish Secret State) in
Lwów Lviv ( uk, Львів) is the largest city in western Ukraine, and the seventh-largest in Ukraine, with a population of . It serves as the administrative centre of Lviv Oblast and Lviv Raion, and is one of the main cultural centres of Ukraine ...
and other major centers in Eastern Poland to sit fast and not evacuate, promising that during peaceful discussions they would be able to keep Lwów within Poland. In response, Khrushchev introduced a different approach to dealing with this ''Polish problem''. Until this time, Polish children could be educated in Polish, according to the curriculum of pre-war Poland. Overnight this allowance was discontinued, and all Polish schools were required to teach the Soviet Ukrainian curriculum, with classes to be held only in Ukrainian and Russian. All males were told to prepare for mobilization into labor brigades within the Red Army. These actions were introduced specifically to encourage Polish emigration from Ukraine to Poland. In January 1945, the NKVD arrested 772 Poles in Lviv (where, according to Soviet sources, on October 1, 1944, Poles represented 66.75% of population), among them 14 professors, 6 doctors, 2 engineers, 3 artists, and 5 Catholic priests. The Polish community was outraged about the arrests. The
Polish underground press Polish underground press, devoted to prohibited materials ( sl. pl, bibuła, lit. semitransparent blotting paper or, alternatively, pl, drugi obieg, lit. second circulation), has a long history of combatting censorship of oppressive regimes in ...
in Lviv characterized these acts as attempts to hasten the deportation of Poles from their city. Those arrested were released after they signed papers agreeing to emigrate to Poland. It is difficult to establish the exact number of Poles expelled from Lviv, but it was estimated as between 100,000 and 140,000.


Transfers from Belarus

In contrast to actions in the Ukrainian SSR, the communist officials in the
Byelorussian SSR The Byelorussian Soviet Socialist Republic (BSSR, or Byelorussian SSR; be, Беларуская Савецкая Сацыялістычная Рэспубліка, Bielaruskaja Savieckaja Sacyjalistyčnaja Respublika; russian: Белор ...
did not actively support deportation of Poles. Belarusian officials made it difficult for Polish activists to communicate with '' tuteishians'' – people who were undecided as to whether they considered themselves Polish or Belarusian.Much of the rural population, who usually had no official identity documents, were denied the "right" of repatriation on the basis that they did not have documents stating they were Polish citizens. In what was described as a "fight for the people", Polish officials attempted to get as many people repatriated as possible, whereas the Belarusian officials tried to retain them, particularly the peasants, while deporting most of the Polish
intelligentsia The intelligentsia is a status class composed of the university-educated people of a society who engage in the complex mental labours by which they critique, shape, and lead in the politics, policies, and culture of their society; as such, the in ...
. It is estimated that about 150,000 to 250,000 people were deported from Belarus. Similar numbers were registered as Poles but forced by the Belarusian officials to remain in Belarus or were outright denied registration as Poles. In response, Poland followed a similar process in regards to the Belarusian population of the territory of the Białystok Voivodeship, which was partially retained by Poland after World War II. It sought to retain some of the Belarusian people.


From Lithuania

The resettlement of ethnic Poles from Lithuania saw numerous delays. Local Polish clergy were active in agitating against leaving, and the underground press called those who had registered for repatriation ''traitors''. Many ethnic Poles hoped that a post-war Peace Conference would assign the Vilnius region to Poland. After these hopes vanished, the number of people wanting to leave gradually increased, and they signed papers for the
People's Republic of Poland The Polish People's Republic ( pl, Polska Rzeczpospolita Ludowa, PRL) was a country in Central Europe that existed from 1947 to 1989 as the predecessor of the modern Republic of Poland. With a population of approximately 37.9 million nea ...
State Repatriation Office representatives. The Lithuanian communist party was dominated by a nationalist faction which supported the removal of the Polish intelligentsia, particularly from the highly contested Vilnius region. Timothy Snyder, ''The Reconstruction of Nations: Poland, Ukraine, Lithuania, Belarus, 1569–1999'', Yale University Press, 2004,
Google Print, p.91-93
The city of Vilnius was considered a historical capital of Lithuania; however, in the early 20th century its population was around 40% Polish, 30% Jewish and 20% Russian and Belarusian, with only about 2–3% self-declared Lithuanians. The government considered the rural Polish population important to the agricultural economy, and believed those people would be relatively amenable to assimilation policies ( Lithuanization). But the government encouraged expulsion of Poles from Vilnius, and facilitated it. The result was a rapid depolonization and Lithuanization of the city (80% of the Polish population was removed). Furthermore, the Lithuanian ideology of "
Ethnographic Lithuania __NOTOC__ Ethnographic Lithuania is a concept that defines Lithuanian territories as a significant part of the territories that belonged to the Grand Duchy of Lithuania and Lithuanians as all people living on them, regardless of whether those ...
" declared that many people who identified as Polish were in fact "polonized Lithuanians". The rural population was denied the right to leave Lithuania, due to their lack of official pre-war documentation showing Polish citizenship. Contrary to the government's agreement with Poland, many individuals were threatened with either arrest or having to settle outstanding debts if they chose repatriation. Soviet authorities persecuted individuals connected to the Polish resistance (
Armia Krajowa The Home Army ( pl, Armia Krajowa, abbreviated AK; ) was the dominant resistance movement in German-occupied Poland during World War II. The Home Army was formed in February 1942 from the earlier Związek Walki Zbrojnej (Armed Resistance) esta ...
and
Polish Underground State The Polish Underground State ( pl, Polskie Państwo Podziemne, also known as the Polish Secret State) was a single political and military entity formed by the union of resistance organizations in occupied Poland that were loyal to the Gover ...
). In the end, about 50% of the 400,000 people registered for relocation were allowed to leave. Political scientist Dovilė Budrytė estimated that about 150,000 people left for Poland.Dovile Budryte, ''Taming Nationalism?: Political Community bBilding in the Post-Soviet Baltic States'', Ashgate Publishing, Ltd., 2005,
Google Print, p.147


See also

* Expulsion of Germans after World War II * Polish minority in Belarus *
Polish minority in Lithuania The Poles in Lithuania ( pl, Polacy na Litwie, lt, Lietuvos lenkai), estimated at 183,000 people in the Lithuanian census of 2021 or 6.5% of Lithuania's total population, are the country's largest ethnic minority. During the Polish–Lithuan ...
* Polish minority in Ukraine *
Population transfer in the Soviet Union From 1930 to 1952, the government of the Soviet Union, on the orders of Soviet leader Joseph Stalin under the direction of the NKVD official Lavrentiy Beria, forcibly transferred populations of various groups. These actions may be classified ...
* Massacres of Poles in Volhynia and Eastern Galicia * Operation Vistula * Repatriation of Ukrainians from Poland to USSR (1944-1946) * Recovered Territories * State Repatriation Office * Repatriation of Poles (1955–1959)


References


Further reading

* Grzegorz Hryciuk, ''Przemiany narodowościowe i ludnościowe w Galicji Wschodniej i na Wołyniu w latach 1931–1948 {{DEFAULTSORT:Polish population transfers (1944-1946) Forced migration Aftermath of World War II in Poland British collusion with Soviet World War II crimes Ethnic groups in Belarus Poland in World War II 1940s in Belarus Ukraine in World War II Aftermath of World War II in the Soviet Union Poland–Ukraine relations Poland–Soviet Union relations Post–World War II forced migrations 1940s in the Soviet Union 1945 in international relations Anti-Polish sentiment in Europe Forced migration in the Soviet Union Soviet World War II crimes Soviet World War II crimes in Poland