What were the causes of the cold war also describe the

Question

What were the causes of the Cold War? Also, describe the steps that the USA took to meet the perceived Soviet threat during the 1940s, '50s and '60s.

Be sure to include the following topics:

1. Iran crisis of 1946
2. Iron Curtain speech
3. Greek Civil War and the Truman Doctrine of 1947
4. containment
5. Marshall Plan
6. Berlin Crisis of 1948
7. Formation of NATO
8. Chinese revolution and creation of the PRC in 1949
9. Korean war
10. Vietnam war