president Wilson instituted a policy of containment in which the U.S. would give economic assistance to countries in Eastern Europe trying to fight communism.
After World War II ended, the Chinese Civil War resumed. Mao Zedong which led the communists using guerilla warfare, Fought against the democratic Nationalists led by Chiang Kai-shek. After three years the communists won in 1949.
NATO was the North Atlantic Treaty Organization. the countries that were involved were the United States, Canada, and ten western European nations.