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United States
July 16, 1945
India conducted its first nuclear weapons test, codenamed "Smiling Buddha," on May 18, 1974. This made India the first country outside of the five permanent members of the United Nations Security Council to possess nuclear weapons.
The first nuclear weapon was used on Hiroshima , Japan . The first nuclear bomb test was conducted in Alamogordo, New Mexico, on July 16, 1945 .
The UK was the third country to obtain nuclear weapons, after the US and the USSR. The UK had its first successful nuclear weapon test in October 1952, a plutonium warhead similar to the one dropped on Nagasaki.