Reasons
The Domino Theory which is the belief that if one country fell to communism, others would follow. *
Many advocated that the U.S. should become involved economically, politically, and militarily in order to contain Communism in North Korea, Vietnam, and Cuba. *
Outcomes
As the end of these conflicts became uncertain, many Americans began to question the U.S. presence in the containment of Communism.
People outside of the United States began to view the U.S. as an aggressor. *