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The United States entered World War I in 1917 due to a combination of factors, including unrestricted submarine warfare by Germany, which threatened American lives and commerce. The sinking of ships like the Lusitania heightened tensions, as did the interception of the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S. These provocations, coupled with a desire to support Allied powers and promote democracy, ultimately led to the U.S. declaring war on Germany in April 1917.

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The U.S entered WW1 on April 6, 1917


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