4. World War II: Arsenal of Democracy
During World War II, the United States transformed into the “Arsenal of Democracy,” producing two-thirds of all Allied military equipment. This industrial prowess not only supplied the U.S. and its allies but also propelled the nation out of the Great Depression, with the economy doubling and tripling in size. The U.S. also led in technological innovations, including the development of the atomic bomb. Post-war, the U.S. played a pivotal role in establishing international institutions like the United Nations, cementing its status as a global superpower (education.cfr.org).
