The forced migration of over a million Poles after World War II

History · Published 3 October 2026 Swipe more like this →

In short: Between 1944 and 1946, Soviet policy orchestrated the mass expulsion of ethnic Poles from the eastern regions of prewar Poland. Officially termed repatriation, this state-controlled movement was a deliberate effort to erase the Polish past from annexed territories, fundamentally altering the demographic landscape of Central and Eastern Europe.

Following the Tehran Conference of 1943 and the Potsdam Conference of 1945, the Soviet Union annexed the Kresy macroregion, incorporating these lands into the Ukrainian, Belarusian, and Lithuanian republics. This geopolitical shift triggered a massive, state-directed population transfer. While officially described as repatriation, the process was effectively an expulsion, as the deported populations were leaving their ancestral homelands rather than returning to them. The Soviet regime used these transfers to solidify control over the newly acquired territories and to facilitate the de-Polonization of the region.

The implementation of these transfers varied significantly by republic. In the Ukrainian SSR, authorities pressured Poles to leave by closing Polish-language schools and threatening mobilization into labor brigades. In Lviv, where Poles constituted a majority in late 1944, thousands were arrested and released only upon agreeing to emigrate. Conversely, in the Belarusian SSR, officials often obstructed the departure of rural populations, viewing them as essential to the agricultural economy, while simultaneously deporting the Polish intelligentsia. In Lithuania, the government pursued a policy of Lithuanization, encouraging the exodus of Poles from Vilnius while restricting the movement of rural residents who lacked official pre-war documentation.

The scale of this displacement was immense, with official data indicating that approximately 1,167,000 Poles left the westernmost Soviet republics between 1945 and 1946. This was part of a broader wave of post-war expulsions that displaced about 20 million people across the continent. Many of the displaced Poles were resettled in what were termed the Recovered Territories, formerly German lands now under Polish administration. This period marked the end of an ancient multi-confessional society in regions like Volhynia, where the ethnic criterion—rather than citizenship—ultimately dictated who was forced to leave and who was required to stay.

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