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The United States bolstered its military forces for World War I primarily through the Selective Service Act of 1917, which instituted a draft that required men aged 21 to 30 to register for military service. This act, along with voluntary enlistments, allowed the U.S. to raise a significant number of troops quickly. Additionally, patriotic fervor and the appeal of serving in the war effort motivated many Americans to enlist voluntarily. By the end of the war, approximately 4.7 million Americans had served in the armed forces.

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4d ago

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