What two cities used atomic weapons you World War 2?
The United States used the atomic bomb on two Japanese cities during World War II. Hiroshima and Nagasaki
Atomic weapons played a major role in fear, but were never actually used in the Cold War. There were multiple instances in which the Soviet Union and United States threatened each other with atomic weapons, such as the Cuban Missile Crisis, but overall no Atomic weapons were ever used on enemy countries which is how the Cold War stayed cold.
The first and best known use of nuclear weapons was during the end of World War II in August 1945 when USA struck cities of Hiroshima and Nagasaki with atomic bombs. No other nuclear weapon has been used as an act of war although some nations still test nuclear weapons according to UN protocols. Answer The first recorded nuclear bomb detonation was the "Trinity" bomb on July 16, 1945.