What Impact Did Joseph McCarthy Have on Domestic Politics in the USA?

The US dealt effectively with the USSR until 1949, especially over the Berlin crisis and setting up NATO to join the West power against Communism. 1950s were a period when many Americans believed they were losing the Cold War.
Politically, the Americans saw Communism spreading through the world. October 1949 China fell to communism, which was a big loss. With the domino effect, Communist North Korea invaded South in 1950. Although South Korea was defended from being taken over by Communism, the fear was never gone in Americans' mind. They realized something had to be done in order to contain Communism. Also, as French left Vietnam during WWII, the Vietminh, led by communist Ho Chi Minh, combined forces of nationalism and communism. …