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Nazi racism was influenced by many ideas stemming back to the mid-nineteenth century. One key idea was that of -, which argued that only those most fit to survive in a competitive world deserved to succeed. Another one was the idea of -, a belief that scientists could racially engineer "superior" peoples through selective breeding.The Nazis turned these ideas into policy, first with the 1933 law for - of genetically inferior people. Ultimately, such policies led to the - of millions of mentally and physically unhealthy people.

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