The Manhattan Project left behind a complex legacy. In the immediate aftermath of World War II, it sparked a nuclear arms race during the Cold War. The Manhattan Project also influenced other nuclear programs, not only in the Soviet Union, but in the United Kingdom and in France, among other countries.
The Manhattan Project was the US government program during World War II that developed and built these first atomic bombs. Detonation of these first nuclear bombs signaled arrival of a frightening new Atomic Age.
