A gentle correction. We dropped two ATOMIC bombs on Japan, not nuclear. Not only is there a difference in the type of reaction, but nuclear releases a lot more energy and is much more powerful. This is a common error of our times, leading to the false claim that the US is the only nation to drop nuclear bombs on another country. The US never did. No entity on earth has done so.
Actually, I’ll correct your correction. A Nuclear bomb is a proper term for either Fission bombs or Fission/Fusion bombs. Atomic bomb is a subclass of Nuclear weapons as is a hydrogen bomb, but it is specific to neither.
Granted. Doesn’t change the observation it took two not one