Where was the nuclear bomb invented?

Answer 1

Leo Szilard invented it in London and patented it in 1934. He signed the patent over to the British Admiralty in 1936 to keep it away from Nazi Germany.

Los Alamos, NM completed design and construction in 1945, after the Manhattan Project spent $2,000,000,000 on infrastructure construction to extract and fabricate the required fissile materials, in plants scattered throughout the US.

These plants were running at a rate that as of August, 1945 three MK-3 Fatman Plutonium-239 core bombs could be built per month. With a planned switch to composite Plutonium-239/Uranium-235 cores in November, 1945 production of MK-3 Fatman bombs would increase to seven per month. This would have allowed us to drop 23 atomic bombs on Japan in 1945 if they had not surrendered.

The fusion bomb was invented at Los Alamos by Stan Ulam & Edward Teller. Teller had been working on a variety of such designs since he first began work on the Manhattan Project, but nothing worked until 1951 when Ulam brought him an idea that fission bomb designers had just begun discussing to improve fission yield but were having trouble analyzing: radiation implosion. Teller quickly recognized this as the missing key to his fusion bomb designs. The result was named the Teller-Ulam design and was tested in the 1952 Ivy Mike shot. Teller frequently attempted to deny that Ulam had contributed anything to the successful fusion bomb design.