Effects of Second World War

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> How can we say that the Second World War led to the Cold War?

1. After WW2, East and West Germany had a major conflict, known as the Cold War.
2. After WW2, USA and Soviet Russia came out as the most powerful nations, and they went head to head in the Cold War.
3. After WW2, France and Italy were involved in the Cold War, as they had fought against each otther in WW2.
4. After WW2, USA and the western European nations became embroiled in a conflict known as the Cold War.