Final answer:
During the Cold War, the main concern of the United States was communism.
Step-by-step explanation:
The main concern of the United States during the Cold War was communism. The Cold War was a period of political tension between the United States and the Soviet Union, and communism was seen as a threat to American values and interests. The United States feared that the spread of communism would lead to the loss of individual freedoms and the expansion of Soviet influence.
Learn more about the concern of the United States during the Cold War