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Germany invaded Poland, settings off war in Europe. The Soviet Union also invaded Poland and the Baltic nations. (German Blitzkrieg)
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Germany invaded France and captured Paris
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Germany bomed London, and the Battle of Britian began.
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The United States gave Brtian war supplies and old naval warships in return for military bases in Bermuda and the Caribbean (Lend Lease)
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Japan bombed Pearl Harbor
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After Japan bombed Pearl Harbor, Germany declared war on the United States. The United States declared war on Japan and Germany.
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The United States was victorious over Japan in the Battle of Midway. This victory was the turning point of the war in Pacific.