TIMELINE: History of major nuclear weapon facilities in the United States

The debate on nuclear weapons is perhaps one of the most controversial topics in the world. Although many countries have signed the Treaty on the Non-Proliferation of Nuclear Weapons some nuclear weapon facilities are still active.

In the United States, nuclear weapon facilities were mostly established because of World War II and the Cold War. The U.S. alone is notable for its two nuclear bombs detonating over Japan’s sky in 1945.

However, since the end of the Cold War in 1991 and the last nuclear weapon test in 1992, most of the nuclear weapon facilities have stopped producing mass nuclear weapons and shifted its primary mission to maintain the safety of existing warheads.