Background: Harry S. Truman (May 8, 1884 - December 26, 1972) was an American statesman who served as the 33rd President of the United States (1945-1953), taking the office upon the death of Franklin D. Roosevelt. A World War I veteran, he assumed the presidency during the waning months of World War II and the beginning of the Cold War. He is known for implementing the Marshall Plan to rebuild the economy of Western Europe, for the establishment of the Truman Doctrine and NATO against Soviet and Chinese Communism, and for intervening in the Korean War. In domestic affairs, he was a moderate Democrat whose liberal proposals were a continuation of Franklin Roosevelt's New Deal, but the conservative-dominated Congress blocked most of them.
Context: Vice President Henry Wallace was popular among Democratic voters, but he was viewed as too far to the left and too friendly to labor for some of Roosevelt's advisers. The President and several of his confidantes wanted to replace Wallace with someone more acceptable to Democratic Party leaders and Roosevelt's advisors, knowing that Roosevelt might not live out a fourth term. Outgoing Democratic National Committee chairman Frank C. Walker, incoming chairman Hannegan, party treasurer Edwin W. Pauley, strategist Ed Flynn, Chicago Mayor Edward Joseph Kelly, and lobbyist George E. Allen all wanted to keep Wallace off the ticket. Roosevelt told party leaders that he would accept either Truman or Supreme Court Justice William O. Douglas. State and city party leaders strongly preferred Truman, and Roosevelt agreed. Truman did not campaign for the Vice-Presidential spot, though he welcomed the attention as evidence that he had become more than the "Senator from Pendergast".  Truman's nomination was dubbed the "Second Missouri Compromise" and was well received. The Roosevelt-Truman ticket achieved a 432-99 electoral-vote victory in the election, defeating the Republican ticket of Governor Thomas E. Dewey of New York and running mate Governor John Bricker of Ohio. Truman was sworn in as vice president on January 20, 1945.  Truman's brief vice-presidency was relatively uneventful. On April 10, 1945, Truman cast his only tie-breaking vote as President of the Senate, against a Robert A. Taft amendment that would have blocked the postwar delivery of Lend-Lease Act items contracted for during the war. Roosevelt rarely contacted him, even to inform him of major decisions; the President and Vice President met alone together only twice during their time in office. In one of his first acts as vice president, Truman created some controversy when he attended the disgraced Pendergast's funeral. He brushed aside the criticism, saying simply, "He was always my friend and I have always been his." He had rarely discussed world affairs or domestic politics with Roosevelt; he was uninformed about major initiatives relating to the war and the top-secret Manhattan Project, which was about to test the world's first atomic bomb. He was also photographed with actress Lauren Bacall sitting atop the piano at the National Press Club as he played for soldiers.  Truman had been vice president for 82 days when President Roosevelt died on April 12, 1945. That afternoon, Truman presided over the Senate as usual. He had just adjourned the session for the day and was preparing to have a drink in House Speaker Sam Rayburn's office when he received an urgent message to go immediately to the White House. Truman assumed President Roosevelt wanted to meet with him, but Eleanor Roosevelt informed him her husband had died after suffering a massive cerebral hemorrhage. Truman's first concern was for Mrs. Roosevelt. He asked if there was anything he could do for her, to which she replied, "Is there anything we can do for you? For you are the one in trouble now!"
Question: What did Truman do while in presidency?. Whats the answer?