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The United States joined World War I in 1917 due to the Zimmermann Telegram, leading to increased tensions and eventual entry into the war.
The United States entered World War I in 1917 primarily due to the Zimmermann Telegram. This document revealed a German proposal to Mexico to form an alliance against the U.S., leading to increased tensions along the US-Mexican border. The intercepted telegram, along with Germany's resumption of unrestricted submarine warfare, prompted President Woodrow Wilson to ask Congress for a declaration of war.
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