Harry S. Truman was the 33rd president of the United States, serving from 1945 to 1953. A lifetime member of the Democratic Party, he previously served as a U.S. senator from the state of Missouri from 1935 to 1945. He was chosen as incumbent president Franklin D. Roosevelt's running mate for the 1944 presidential election. Truman was inaugurated as the 34th vice president in 1945 and served for less than three months until President Roosevelt died. Now serving as president, Truman implemented the Marshall Plan to rebuild the economy of Western Europe and established both the Truman Doctrine and NATO to contain the expansion of communism. He proposed numerous liberal domestic reforms, but few were enacted by the Conservative Coalition that dominated the Congress.