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German forces invade Poland, beginning World war 2
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Germany invades France.
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Former Soviet revolutionary Leon Trotsky is killed in Mexico.
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Japan attacked Pearl Harbor, drawing the United States into WW2.
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Gandhi is arrested after calling for Britain to leave India.
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Penicillin comes into wide use as an antibiotic.
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The Allies storm ashore at Normandy France, on D-Day.
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Soviet troops discover an abandoned Nazi death camp.
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The first large automatic computers is developed.
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German formally surrEnders.
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Japan surrenders after atomic bombs are dropped on Hiroshima and Nagasaki.