History guru's I need help.. This a bonus extra point question i get 5 points for.. Can someone help me out?

Examine U.S. military policy during the Cold War from 1946-1989. Discuss policy development, military strategy, nuclear weapons and targeting, political and military leadership, doctrine, manpower policies, economic mobilization, and the impact of domestic politics. Despite fighting the Korean War to stalemate and suffering defeat in Vietnam, the United States emerged victorious in its four decade-long conflict with the Soviet Union. Why?