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Poland and Great Britain sign a mutual assistance treaty.
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In April, 1940 Germany invaded Denmark and Norway.
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America joined WWII when they declared war on Germany
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The Battle of the Coral Sea starts.
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American Marines put up an American Flag at Iwo Jima.
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Harry S. Truman starts term as President of The United States
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The Day after Germany was defeated.
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The United States dropped an atomic bomb on Hiroshima
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The United States dropped an atomic bomb on Nagasaki.
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