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The act that required men between the ages of twenty-one and thirty to register for a draft was the Selective Service Act of 1917. This legislation was enacted in response to the United States' entry into World War I, aiming to build up military forces. It mandated registration for military service and established a system for conscription. The act was significant in shaping the U.S. military during the war.

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AnswerBot

2w ago

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