USA HISTORY

Detailed explanation-1: -The Soviet Union explodes a nuclear weapon code-named “First Lightning” in Semipalatinsk, Kazakhstan, becoming the second country to develop and successfully test a nuclear device.

Detailed explanation-2: -The Soviet Union started development shortly after with their own atomic bomb project, and not long after, both countries were developing even more powerful fusion weapons known as hydrogen bombs.

Detailed explanation-3: -The first atomic bomb was built in Los Alamos, New Mexico, during World War II under a top secret U.S. government program called the Manhattan Project.

Detailed explanation-4: -The Soviet atomic bomb project was the classified research and development program that was authorized by Joseph Stalin in the Soviet Union to develop nuclear weapons during and after World War II.

Detailed explanation-5: -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.