What major countries were involved in Atomic Bombs dropping on Japan?

Answer 1

USA and Canada because Canda has the World Second largest Uranium deposit that is a necessary to make atomic bomb and close to USA, just directly above USA. (Regardless of Little Boy, an Uranium Bomb or Fat Man , a Plutonium Bomb that is used to be naturally occured , now extinct element that needs to be man-made from Uranium to decay into Plutonium inside the nuclear reactors.)