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Adolf Hitler is appointed Chancellor of Germany.
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Nazis invade Poland (Jewish pop. 3.35 million, the largest in Europe). Beginning of SS activity in Poland.
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Paris is occupied by the Nazis.
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The Battle of Britain was the German air force's attempt to gain air superiority over the RAF.
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Japanese attack United States at Pearl Harbor. The next day the U.S. and Great Britain declare war on Japan.
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President Roosevelt asked Congress to declare war against Japan. Germany and Italy, allied with Japan, declared war on the United States.
