The Manhattan Project was a top-secret research and development initiative led by the United States during World War II. It aimed to develop atomic weapons, specifically atomic bombs. The project involved collaboration among scientists, engineers, and military personnel, focusing on harnessing nuclear fission to create a powerful weapon.
Ultimately, the Manhattan Project successfully produced the world's first atomic bombs, which were used in the bombings of Hiroshima and Nagasaki in 1945.
The project's proponents included key figures like J. Robert Oppenheimer, General Leslie Groves, and physicist Enrico Fermi, with support from the U.S. government, including Presidents Franklin D. Roosevelt and Harry S. Truman. Opponents of the project included countries like Germany and Japan, as well as individuals against the use of atomic bombs and nuclear weapons in general.