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Nuclear Weapons/Warheads: United States

Country of Origin: USA

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Since the detonation of the first nuclear device July 16, 1945, at the Trinity test site near Los Alamos, N.M., the United States has engaged in research and development on a variety of nuclear warheads.

Significant Milestones In U.S. Nuclear Weapons Development

Jan. 25, 1939: The first successful fission experiment in the United States takes place at Columbia University.

Jan. 26, 1939: Niels Bohr announces the discovery of fission at a conference on theoretical physics at the...

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