A nuclear war never happened. You may be thinking of the Cuban Missile Crisis when the world came very close to nuclear war.
The Cuban Missile Crisis is the event that brought the world closest to a nuclear fallout.
the battle of Britain
Mankind
The atomic bomb
It brought the world into the nuclear/space age.
The assassination of Archduke Ferdinand was the one event that pushed Europe over the edge and brought about World War I.
the genocide of Tutsis
Nuclear attack to japan
Aliens brought life to Earth. The end.
World War II brought the end of colonialism.
The Cuban Missile Crisis.
It is due to the balkans problem