USA HISTORY

Detailed explanation-1: -In August 1945, the atomic bombings of Hiroshima and Nagasaki were conducted by the United States against Japan at the close of that war, standing to date as the only use of nuclear weapons in hostilities.

Detailed explanation-2: -The atomic bombings of Hiroshima and Nagasaki were the detonation of two atomic bombs over the Japanese cities of Hiroshima and Nagasaki on 6 and 9 August 1945 by the United States.

Detailed explanation-3: -First Soviet Test. The Soviet Union detonated its first atomic bomb, known in the West as Joe-1, on Aug. 29, 1949, at Semipalatinsk Test Site, in Kazakhstan.

Detailed explanation-4: -It would only be a matter of months before the U.S.S.R. exploded its own atomic bomb. The Soviets successfully tested their first nuclear device, called RDS-1 or “First Lightning” (codenamed “Joe-1” by the United States), at Semipalatinsk on August 29, 1949.