The atomic bomb was not invented by any country, it was invented in 1933 by Leo Szilard (he was in London at the time, so when he patented the invention he sold it to the British Admiralty who classified it to keep the idea away from the Nazis).
However following the discovery in 1939 of fission in uranium-235 by a team working in Germany and Sweden, the atomic bomb was independently reinvented (without any knowledge of Szilard's classified invention) by scientists in almost every industrialized country in the world.
However it took the Manhattan Project (a joint U.S., U.K. Canada project) to actually build the massive industrial infrastructure needed to begin building atomic bombs. No other country was even prepared at the time to make this level of investment in such a speculative technology and anything less could not have succeeded in building an atomic bomb that could both work and be deliverable to a target.
the atomic bomb was not discovered, it was invented then built.
US
china
The US .
Franklin Delano Roosevelt
The atomic bomb that destroyed Nagasaki and Hiroshima, Japan.
the atomic bomb was not discovered, it was invented then built.
Never! Leo Szilard invented the atomic bomb in 1933.
In what country was the plan devised to create an atomic bomb?
The atomic bomb was not invented by a project, it was invented by Leo Szilard in 1933.However the Manhattan Project built the first ones in 1945.
Einstein did not invent the atomic bomb, Leo Szilard did.
The A-Bomb was invented in 1945.
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1353.
USA
Leo Szilard.
The atomic bomb was developed and built towards the end of WW2. The purpose of the bomb was to cause enough death and destruction that the country it was used would immediatly surrender. With this in mind, the US dropped the first atomic device on Nagasaki and Hiroshimo in Japan, 1945 ending the war.