With the death of President Franklin D. Roosevelt on April 12, 1945, Vice President Harry S. Truman assumed the Oval Office. He surely knew he faced a difficult set of challenges in the immediate future: overseeing the final defeats of Germany and Japan; managing the U.S. role in post-war international relations; supervising the American economy's transition from a war-time to a peace-time footing; and maintaining the unity of a fractious and powerful Democratic Party.