Forced deportation, mass evacuation and displacement of peoples took place in many of the countries involved in World War II. These were caused both by the direct hostilities between Axis and Allied powers, and the border changes enacted in the pre-war settlement. The crisis in former Axis-occupied territories after liberation provided the context for much of the new international refugee and human rights architecture that survives today.
Some of the belligerents expelled or ethnically cleansed people perceived as being associated with enemy belligerents. Eastern Europe was a major location of these displacements, although Japanese were expelled from some locations during and after the war by Allied countries. The Holocaust also involved deportations and expulsions.
- 1939 to 1945 The Expulsion of Poles by Germany. During World War II, Nazis planned to ethnically cleanse the whole Polish population according germanisation plan - Generalplan Ost. Eventually during Nazi occupation up to 1.6 to 2 million Poles were expelled, not counting millions of slave labourers deported from Poland.
- 1939 to 1940 Expulsions of 680 000 Poles from German occupied Wielkopolska (German -Reichsgau Wartheland). Only from the city Poznań Germans expelled to General Government 70 000 of Poles. By 1945 half a million Volksdeutsche Germans from Soviet Union, Bessarabia, Romania and the Baltic Germans had been resettled during action "Heim ins Reich" by German organisations like Hauptamt Volksdeutsche Mittelstelle and "Resettlement departament" of RKFDV (Stabshauptamt Reichkomissar für die Festigung deutsches Volkstums) from the East Europe.
- 1939 to 1940 Expulsions of 121 765 Poles from German occupied Pomerania. On Polish places 130 000 Volksdeutsche was settled including 57 000 Germans from East Europe countries: Soviet Union, Bessarabia, Romania and the Baltic states. Deportation was a part of German "Lebensraum" policy ordered by German organisations like Hauptamt Volksdeutsche Mittelstelle and "Resettlement departament" of RKFDV.
- 1939 to 1940 The first evacuation of Finnish Karelia was the resettlement of the population of Finnish Karelia and other territories ceded by Finland to the Soviet Union after and during the Winter War into the remaining parts of Finland. Some of the territories were evacuated during the war or before it, as part of the course of the war. Most of the territory was evacuated after the Soviet Union gained it as a part of the Moscow peace treaty. In total,410,000 people were transferred.
- 1940 to 1941 The Soviets deported hundreds of thousands of Polish citizens, most in four mass waves. The accepted figure was over 1.5 million. The most conservative figures use recently found NKVD documents showing 309,000 to 381,220. The Soviets didn’t recognise ethnic minorities as Polish citizens, some of the figures are based on those given an amnesty rather than deported and not everyone was eligible for the amnesty therefore the new figures are considered too low. The original figures were: February, 1940 over 220,000; April around 315,000; June–July between 240,000 to 400,000; June, 1941, 200,000 to 300,000.
- 1940 to 1941 Expulsions of 17 000 Polish and Jewish residents from the western districts of city Oświęcim from places located directly adjacent to Auschwitz Concentration Camp, and also from the villages of Broszkowice, Babice, Brzezinka, Rajsko, Pławy, Harmęże, Bór, and Budy. The Expulsion of Polish civilians was a step towards establishing the Camp Interest Zone, which was set up in order to isolate the camp from the outside world and to carry out business activity to meet the needs of the SS. German and Volksdeutsche settlers move in. This was one of the numerous forced migrations associated with the Holocaust.
- 1940 to 1941 The deportation of Volga Germans by Soviet Union to Kazakhstan, Altai Krai, Siberia, and other remote areas.
- 1941 to 1944 During the Finnish occupation of East Karelia during World War II the Russian-speaking population of the city of Petrozavodsk was held in a concentration camp.
- 1941 to 1944 Expulsion of Poles from Zamość region was performed in November 1941, and continued by June/July 1943 which was code named Wehrwolf Action I and II to make room for German (and to a lesser extent, Ukrainian) settlers as part of Nazi plans for establishment of German colonies in the conquered territories. Around 110,000 people from 297 villages were expelled. Around 30,000 victims were children who, if racially "clean" (i.e. had physical characteristics deemed "Germanic") were planned for germanisation in German families in the Third Reich. Most of the people expelled were sent as slave labour in Germany or to concentration camps.
- 1941 to 1944 in Kosovo & Metohija, some 10,000 Serbs lost their lives, and about 80,000 to 100,000 or more were ethnically cleansed.
- 1941 to 1945 More than 250,000 Serbs were expelled from Croatia and Bosnia by the extreme nationalist Ustashe regime during the Serbian Genocide.
- 1941 to 1949 During World War II, Japanese-Americans and Japanese-Canadians were interned in camps.
- 1943 to 1944 The Deportation of Crimean Tatars, Kalmyks, Chechens, Ingush, Balkars, Karachays, and Meskhetian Turks by Soviet Union to Central Asia and Siberia.
- 1943 to 1944 The ethnic cleansing and massacres of Poles in Volhynia by nationalist UPA with the bulk of victims reported in summer and autumn 1944.
- 1943 to 1960 The Istrian-Dalmatian Exodus involved the diaspora of 350,000, mostly ethnic Italians together with anti-communist Slovene and Croat people, from Istria, Fiume and Dalmatian lands (mainly from the city of Zara), after the collapse of Italian fascist regime.
- 1944 The displacement of the majority ethnic Estonian population from the Estonian city of Narva by Soviet occupation authorities.
- 1944 The second Evacuation of Finnish Karelia. During the Continuation War, some 280,000 Finns had returned to areas ceded in 1940 to the Soviet Union and subsequently re-conquered by Finland in 1941. During summer and autumn 1944, Finland re-ceded these areas back to the Soviet Union, and re-evacuated the Finnish population.
- 1944 The evacuation of almost total civilian population of Finnish Lapland, as a joint Finnish-German effort, before Finnish and German troops commenced hostilities in Lapland War. The evacuees, numbering 168,000 were able to return home within a year.
- 1944 to 1945 The ethnic cleansing of Hungarians, or the massacres in Bačka by Titoist partisans during the winter of 1944-45, about 40.000 massacred. Afterwards, between 45-48, internment camps were set which led directly to the death of 70.000 more, of famine, frost, plagues, tortures and executions.
- 1944 to 1945 The ethnic cleansing of Cham Albanians from Thesprotia Prefecture by Greeks which took place, circa 16,000-20,000 fled to Albania, and 200-300 were killed.
- 1944 to 1947 & 1951 The mass deportation of Ukrainian speaking ethnic minorities from the territory of Poland after World War II, culminating in 1947 with the start of Operation Vistula.
- 1944 to 1947 & 1951 1.5 million Poles were deported from the eastern territories annexed by the Soviet Union into the western territories, which Soviets transferred from Germany to Poland. By 1950, 1.6 million Poles from the eastern territories annexed by the Soviet Union had been settled in what the government called the Regained Territories.
- 1944 to 1948 Expulsion of Germans after World War II. Between 13.5 and 16.5 million Germans were expelled, evacuated or fled from Central and Eastern Europe, making this the largest single instance of ethnic cleansing in recorded history. Estimated number of those who died in the process is being debated by historians and estimated between 500,000 and 3,000,000.
- In November and December 1944, more than 200,000 Danube Swabians in Yugoslavia were expelled from their homes and interned in starvation and concentration camps for the old, young and disabled. Some 30,000 workers were expelled to Russia as slave laborers for war reparations.
- During and after World War II, about 250,000/350,000 Italians left western Yugoslavia in Istrian exodus.
- After World War II in Manchuria under Soviet occupation soon become a battlefield between the Chinese communist forces and the Nationalist forces was home to hundreds of thousands of Japanese citizens. All these were now to be expelled.
- Korea, now free from Japanese rule, and Sakhalin, under Soviet military occupation, were Japanese territories before World War II and had millions of Japanese residents. All these were now to be expelled.
- Taiwan was ceded to Japan in 1895 and by the beginning of World War II many Japanese civilians had settled there. Between the Japanese surrender of Taiwan in 1945 and April 25 1946 the occupying Republic of China forces expelled 90% of the Japanese living in Taiwan.
- More than 30,000 Serbs were expelled from Bulgarian occupied Macedonia and south-eastern Serbia
- Aliyah Bet was the code-name for illegal immigration of Jews to the Levant in the 1930s and 1940s, while the Holocaust was occurring, and the existence of numerous displaced people, of Jewish identity, was a major reason for the birth of the state of Israel. Those migrants were helped by an underground group called Bricha. After the country was born, European Jewish migration to Israel continued, contributing to that country's population growth. The Kielce pogrom and other antisemitic incidents were contributing factors. (This migration could be seen as an expulsion, given the conditions faced by European Jews at the time.)
Establishment of refugee organisations 
The United Nations Relief and Rehabilitation Administration was set up in 1943, to provide humanitarian relief to the huge numbers of potential and existing refugees in areas facing Allied liberation. UNRRA provided billions of US dollars of rehabilitation aid, and helped about 8 million refugees. It ceased operations in Europe in 1947, and in Asia in 1949, upon which it ceased to exist. It was replaced in 1947 by the International Refugee Organization (IRO), which in turn evolved into United Nations High Commissioner for Refugees (UNHCR) in 1950.
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