Physicists first split the atom in 1938, in the process known as nuclear fission.
When world war ll broke out, scientist all over Europe started working on nuclear fission programs. American scientists too tried to work together so that they could easily and quickly create fissionable materials for a nuclear bomb.
Atomic bombs are nuclear weapons that use the energy output of nuclear fission to produce massive explosions.
The US army decided to take over the project under command of general Leslie groves, with a research team led by j. robert oppenheimer. The result of their research led to the bombs that destroyed Hiroshima and Nagasaki and ended world war ll.