Harry S. Truman was the 33rd President of the United States, serving from 1945 to 1953, and is best known for his decisive leadership during the early Cold War era. His presidency witnessed significant events, including the conclusion of World War II, the Potsdam Conference, and the formation of NATO, shaping the geopolitical landscape of post-war Europe and the subsequent division of Germany. Truman's foreign policy laid the groundwork for America's involvement in global conflicts and the establishment of military alliances.