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Germany and the Soviet Union agree to a nonaggression pact leaving the Soviets free to strengthen their western frontier, and Hitler free to attack Poland.
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Official beginning of WWII
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Adolf Hitler takes neutral Denmark, Norway, Belgium, Holland, and Luxembourg.
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Benito Mussolini's Italian forces attack France from the south.
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Responding to the embargoes imposed by the United States, Japan joins the German-Italian alliance.
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Germany invades the Soviet Union violating the Nonaggression Pact.
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The Japanese government decides to attack Pearl Harbor if negotiations with the United States fail.
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Germany and Italy, Japan's axis partners, declare war on the United States. The United States declares war on Germany, Italy, and Japan.
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The Italian government officially surrenders to the Allied powers; still, German forces occupy much of Italy.
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The Allies capture German holdings in Naples.
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U.S. forces, aided by a Free French division, liberate Paris from Nazi control.
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Allied forces take the beaches of Normandy.
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Germany surrenders to the Allies
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The United States drops an atomic bomb on Hiroshima, killing 75,000 people instantly, and injuring more than 100,000.
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A second atomic bomb is dropped in Nagasaki
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Japan surrenders, ending the war.