What did the selective service act mean for American man?

The Selective Service Act, enacted in 1917 during World War I, mandated that American men aged 21 to 30 register for military service, later expanded to include ages 18 to 45. This law marked a significant shift in the U.S. approach to military recruitment, transitioning from voluntary enlistment to a draft system. For many men, this meant the obligation to serve in the military, impacting their lives, careers, and families. The act symbolized the nation's commitment to mobilizing resources for the war effort and contributed to a sense of collective responsibility among citizens.