Describe the significance of the Truman Doctrine to the Cold War. How did the Marshall Plan impact the future of Europe? How did the social and racial changes that occurred during WWII impact U.S. society after the war? What is NATO and why was (is) it important to the West? What was the Red Scare? What role did the HUAC (House Un-American Activities Committee) play during the Red Scare? What was the overall impact of the Red Scare on U.S. society?