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When did World War II officially start?

User Narish
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2 Answers

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World War II began on September 1, 1939 and ended on September 2, 1945.
User Kevin Coulombe
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Answer:

World War II began in Europe on September 1, 1939, when Germany invaded Poland.

Explanation: World War II or the Second World War, often abbreviated as WWII or WW2, was a global war that lasted from 1939 to 1945

User Hannes Stoolmann
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