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In page Diaspora:

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After World War II, the Soviet Union and communist-controlled Poland, Czechoslovakia, Hungary and Yugoslavia expelled millions of ethnic Germans, most of them were the descendants of immigrants who had settled in those areas centuries ago. This expulsion was allegedly carried out in reaction to Nazi Germany's invasions and pan-German attempts to annex Eastern European territory.[citation needed] Most of the refugees moved to the West, including western Europe, and with tens of thousands seeking refuge in the United States.