What was the Cold War? How did the relationship between the United States and the Soviet Union change after World War II? How did the Cold War cause the Red Scare? Include a discussion of McCarthyism.

The Cold War was a period of geopolitical tension between the Soviet Union and the United States and their respective allies, the Eastern Bloc and the Western Bloc, after World War II. Historians do not fully agree on the dates, but the period is generally considered to span the 1947 Truman Doctrine to the 1991 dissolution of the Soviet Union. The term "cold" is used because there was no large-scale fighting directly between the two superpowers, but they each supported major regional conflicts known as proxy wars.

A Red Scare is the promotion of a widespread fear of a potential rise of communism or anarchism by a society or state. The term is most often used to refer to two periods in the history of the United States which are referred to by this name. The First Red Scare, which occurred immediately after World War I, revolved around a perceived threat from the American labor movement, anarchist revolution, and political radicalism. The Second Red Scare, which occurred immediately after World War II, was preoccupied with the perception that national or foreign communists were infiltrating or subverting U.S. society and the federal government. The name refers to the red flags that the communists use.

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