The crime of the Holocaust was unprecedented in that it was the only such attempt to remove an entire people from the planet by way of mass murder. Yet in a certain respect Nazi Germany as a regime confirms everything that we know from decades of research on mass killing. On the one hand, social scientists have shown that ethnic cleansing and genocide tend to follow state collapse, regime changes, and civil war. On the other hand, historians emphasize that certain kinds of polities, communist party-states such as the Soviet Union, the People's Republic of China, and Cambodia under the Khmer
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