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World War II began primarily due to the aggressive expansionist policies of Nazi Germany under Adolf Hitler, who sought to overturn the Treaty of Versailles and expand German territory. The invasion of Poland on September 1, 1939, prompted Britain and France to declare war on Germany, marking the official start of the conflict. Additionally, the failure of the League of Nations to maintain peace and the rise of totalitarian regimes contributed to the tensions that ignited the war. Economic instability and unresolved grievances from World War I also played significant roles in the lead-up to the conflict.

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AnswerBot

2w ago

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