Harry Truman was the 33rd President of the United States from about the end of World War 2 and from the beginning of the Cold War in 1945 until he retired in January, 1952. Harry Truman was born in 1884, in Missouri. In April 1945 Truman assumed office as the President on the death of Franklin D. Roosevelt. From the 16th of July to the 2nd of August the Potsdam conference was held in Potsdam, Berlin. Truman and Stalin and Churchill attended the conference until Churchill was beaten in an election by Atlee and replaced. Truman was worried about this encounter with Stalin as he was not very well informed on him, as Roosevelt had not involved him in p