the first nuclear bomb was set off on july 16, 1945.
the first nuclear bomb was set off on july 16, 1945.
when was the first nuclear bomb set off?
july 16 , 1945
the united states developed the first nuclear weapons during world war ii in cooperation with the united kingdom and canada as part of the manhattan project, out of the fear that nazi germany would develop them first. it tested the first nuclear weapon on july 16, 1945 ("trinity") at 5:30 am, and remains the only country to have used nuclear weapons in war, devastating the japanese cities of hiroshima and nagasaki. it was the first nation to develop the hydrogen bomb, testing an experimental prototype in 1952 ("ivy mike") and a deployable weapon in 1954 ("castle bravo"). throughout the cold war it continued to modernize and enlarge its nuclear arsenal, but from 1992 on has been involved primarily in a program of stockpile stewardship. the u.s. nuclear arsenal contained 31,175 warheads at its cold war height (in 1966). during the cold war, the united states built approximately 70,000 nuclear warheads, more than all other nuclear-weapon states combined.
list of states with nuclear weapons
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list of aircraft weapons