Harry S. Truman was the 33rd president of the United States, serving from 1945 to 1953. A member of the Democratic Party, he assumed the presidency after Franklin D. Roosevelt's death, as he was vice president at the time. Truman implemented the Marshall Plan in the wake of World War II to rebuild the economy of Western Europe and established both the Truman Doctrine and NATO to contain the expansion of Soviet communism. He proposed numerous liberal domestic reforms, but few were enacted by the conservative coalition that dominated Congress.