On December 7, 1941, following the Japanese bombing of Pearl Harbor, the United States declared war on Japan. Three days later, after Germany and Italy declared war on it, the United States became fully engaged in the Second World War.
U.S. involvement in the Second World War was quickly followed by a massive mobilization effort. With millions of men and women serving overseas in the nation's armed forces, most of those who remained at home dedicated themselves to supporting the war effort in whatever means was available to them.
Women, who had worked as homemakers or had held jobs outside military-related industries, took jobs in aircraft manufacturing plants, munitions plants, military uniform production factories, and so on. As the need for steel and other resources increased, American citizens participated in rationing programs, as well as recycling and scrap metal drives. Americans also supported the war effort with their hard-earned dollars by purchasing Liberty bonds. Sold by the U.S. government, the bonds raised money for the war and helped the bond purchasers feel they were doing their part for the war effort.
The Japanese attack on Pearl Harbor marked the beginning of the Pacific war for the U.S., but it did not necessarily mean that the U.S. had become a combatant in the war in Europe. By December 1941, German armies had stalled on the Eastern Front, and it seemed hard for Adolf Hitler to declare war on yet another great power under such circumstances. The Tripartite Pact only obligated Germany to defend Japan if the latter was attacked, not if it was the aggressor. Nevertheless, Germany declared war on the United States on December 11, 1941.
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