The US was the first country to develop the Atom bomb by the end of WWII and the president at the time (Harry Truman) used it to end WWII by droping it to Japan twice in different cities.
The nuclear bomb was worst. Japan couldn't even reconstruct the country after the bomb and after the tsunami they did well working.
We did not want Germany, Japan, Italy, or the USSR to know we were working on it.
It didn't. Japan existed long before the atomic bomb
The first atomic bomb was dropped on Hiroshima, Japan ; another on Nagasaki, Japan, 3 days later.
Harry s. truman approved the dropping of an atomic bomb on japan.
The US dropped the atomic bomb onto Japan on August 1945.
atomic bomb
Japan was negotiatin with the Soviet Union as the first atomic bomb was dropped.
Japan was trying to develop weapons which could reach the US. balloon carrying fire bombs did reach the US but those didn't do much. The real deal was that Germany was trying to develop an atomic bomb but the US beat them. We don't have proof that Japan were trying to develop one. August 6 and 9 1945, Japan suffered the pain of the nuclear bombs.
Reconstruction.
Hiroshima, Japan