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Nuclear Weapons/Warheads: United States

Country of Origin: USA


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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