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World War II began on september 1, 1939 When Germany invasdes Poland.
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September 17, 1939
The Soviet Union invades Poland from the east. -
April 9 –June 9
Germany invades Denmark and Norway. Denmark surrenders on the day of the attack; Norway holds out until June 9. -
Italy enters the war an invades France on June 21st
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Japan bombs Pearl Harbor.
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The United States declares war on Japan, entering World War II.
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US and British troops land on Sicily. By mid-August, the Allies control Sicily.
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Soviet troops liberate Kiev.
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US troops land in the Philippines.
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The United States drops an atomic bomb on Hiroshima.
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Having agreed in principle to unconditional surrender on August 14, 1945, Japan formally surrenders, ending World War II.