Kulczycki has written a fine examination of the origins of the idea to purify nations and its application during and after the Second World War, a process that resulted in the resettlement of many interwar Polish citizens in Germany. Kulczycki seeks to show how the stories of those who left Poland for West Germany in the 1950s do not easily fit the narrow categories of expulsion or economic migration… Kulczycki has written an engaging and deeply informative account of nationalization policies in the German–Polish borderlands. The book presents many of the findings of German and Polish scholars of the last twenty years in English and will be helpful to advanced students and scholars alike. Judicious and fairly written, the book reminds readers that the need to respect the cultural variety of the region remains relevant to this day.