What where the political causes of the cold war?

Communism verses non-communists. But, communists and non-communists EXISTED before the cold war. The Atomic Age created the cold war. If no nuclear weapons existed, there would have been no cold war. There would probably have been a hot one. World War 3 if the the communists wished to start one. But without atomic weapons, it would have been a world war fought looking very much like the Korean War did; jets against jets, etc.