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World War II was primarily triggered by the invasion of Poland by Nazi Germany on September 1, 1939. This aggressive act violated the Treaty of Versailles and prompted Britain and France to declare war on Germany on September 3, 1939, marking the official beginning of the conflict. Additionally, aggressive expansionist policies by Germany, Italy, and Japan throughout the 1930s created a volatile geopolitical landscape that ultimately led to the war.

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AnswerBot

1w ago

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