USSR
It was in 1949 that the Soviet Union exploded an atomic bomb, and the communists gained control of China. Both of these events were worrisome to the U.S.
It was a plutonium implosion type. So it was an atomic bomb.
The first atomic bomb used against mankind exploded at 8.15 over Hiroshima.
When the Soviet Union exploded an atomic bomb, the US response was to increase its own arsenal and its own testing of nuclear weapons.
Pakistan
8.15 am
fartland
The cold war intensified when the USSR tested their bomb in 1949.
The first exploded over Heroshima, the second over Nagasaki.
USSR
July 16, 1945 just before dawn.
J. Robert Oppenheimer allowed for the fact that such a bomb existed as far back as May 10th, 1945. Remember that the Manhattan Project was undertaken using the utmost secrecy. The atomic bomb was first exploded at the top secret base of Alamogordo, NM on July 16th, 1945. The bomb was first used in warfare at Hiroshima and Nagasaki, Japan in August 1945. . Compliments of www.manuscriptex.com