Nuclear fission discovery and the Manhattan Project led to the U.S. development of nuclear weapons.
Nuclear fission was discovered by German physicists Otto Hahn and Fritz Strassman in 1938. The possibility of a self-sustained chain reaction was recognized by scientists worldwide, leading to the start of the Manhattan Project by the U.S. government in 1942 to develop nuclear weapons. The project successfully exploded the first nuclear device in 1945, altering the course of history and fueling a nuclear arms race.
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