After World War II, some 12 million Germans, 3 million Poles and Ukrainians, and tens of thousands of Hungarians were expelled from their homes and forced to migrate to their supposed countries of origin. Using freshly available materials from Polish, Ukrainian, Russian, Czechoslovak, German, British, and American archives, the contributors to this book provide a sweeping, detailed account of the turmoil caused by the huge wave of forced migration during the nascent Cold War. The book also documents the deep and lasting political, social, and economic consequences of this traumatic time, raising difficult questions about the effect of forced migration on postwar reconstruction, the rise of Communism, and the growing tensions between Western Europe and the Eastern bloc. Those interested in European Cold-War history will find this book indispensable for understanding the profound―but hitherto little known―upheavals caused by the massive ethnic cleansing that took place from 1944 to 1948.