This paper explains the Soviet Union's physical and ideological expansion, post-World War II, into many
countries, known
as the "Soviet Block"; on the other hand, the American
economy was much stronger than the Soviet economy, and many
countries in the United Nations were friendly toward the United States. The author points out that, during the Cold War, there was never a direct confrontation between the United States and the Soviets; however, there were conflicts between client nations, which were used to carry out the policies of the superpowers, such as Korea and Vietnam. The paper elucidates that the Vietnam War did more than any war to change the American perspective on foreign involvement