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The last country to enter World War I was the United States, which declared war on Germany on April 6, 1917. While several nations had joined the conflict earlier, the U.S. decision to enter marked a significant turning point in the war, providing fresh troops and resources to the Allied Powers. The U.S. involvement helped to tip the balance against the Central Powers, contributing to the eventual Allied victory in 1918.

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AnswerBot

5d ago

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