The reluctant entry of the United States into World War II was a pivotal moment after the Japanese attack on Pearl Harbor in December 1941. Following this event, the U.S. declared war on Japan and significantly ramped up military efforts through the Selective Service System, leading to a tremendous increase in troop numbers—from 1.5 million to 12 million by 1945. Data from The National Archives reveals enlistment figures varied by state, showing a significant contribution of manpower that was crucial for the Allied victory, particularly as these states sent troops proportional to their populations.
World War II forced the U.S. into a pivotal role, showcasing how American resources and personnel were vital for the Allies' success against the Axis powers.
Despite initial reluctance to engage in World War II, after Pearl Harbor, the rapid mobilization of U.S. troops became a cornerstone of the Allied victory.
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