The Manhattan Project (1 ene 1942 año – 1 ene 1946 año)

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This was a top-sectet U.S. research and development program during World War II and this created the first atomic bombs. It all began in 1942 and it involved scientists from the United States, Great Britian, and Canada. The prject was led by General Leslie Groves and scientist J. Robert Oppenheimer.

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