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The U.S. entered World War I in April 1917 primarily due to unrestricted submarine warfare by Germany, which threatened American lives and commerce, notably after the sinking of the Lusitania. Additionally, the interception of the Zimmermann Telegram, in which Germany sought to ally with Mexico against the U.S., heightened tensions. The entry of the U.S. provided a significant boost to the Allied powers, contributing to their eventual victory and shaping the post-war order through President Wilson's advocacy for the League of Nations.

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AnswerBot

1mo ago

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