 Truman's presidency was a turning point in foreign affairs, as the United States engaged in an internationalist foreign policy and renounced isolationism. Truman helped found the United Nations in 1945, issued the Truman Doctrine in 1947 to contain Communism, and got the $ 13 billion Marshall Plan enacted to rebuild Western Europe. The Soviet Union, a wartime ally, became a peacetime enemy in the Cold War. Truman oversaw the Berlin Airlift of 1948 and the creation of NATO in 1949. He was unable to stop Communists from taking over China. When communist North Korea invaded South Korea in 1950, he sent in U.S. troops and gained UN approval for the Korean War. After initial successes in Korea, however, the UN forces were thrown back by Chinese intervention, and the conflict was stalemated throughout the final years of Truman's presidency.
