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The holocaust happened because Hitler REALLY believe that the Jews were weak and evil, and the Aryan race is the best and on top, and the fact Hitler wasn't even Aryan shows how dedicated he was.

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As we know, Hitler was in power mostly around the WW2 Era and was a very extreme dictator and could practically do what he wanted because if anyone ever spoke up about him, they would most certainly die, and the outside world didn't really know about what was happening until much later.

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The Holocaust was a long and terrible even that lasted from 1933 to 1945 which around 6 million Jews and people of other groups were killed by Nazi Germany due to Hitler's extremists views on "sub-race" where the Jews were eon the bottom while the Aryans were on top.