Who was the U.S. president who succeeded Franklin D. Roosevelt in 1945?

Harry Truman succeeded Franklin D. Roosevelt as president in 1945. He became president after Roosevelt's death on April 12, 1945. Truman had been serving as vice president during Roosevelt's fourth term and stepped into the presidency during a critical period at the end of World War II. His administration faced significant challenges, including the decision to use atomic bombs on Japan, the initiation of the Cold War, and the implementation of the Marshall Plan to aid European recovery.

Truman's leadership marked a transition in U.S. foreign policy, as he emphasized a more active role for the United States in global affairs compared to Roosevelt's approach. His presidency also saw the establishment of key policies and institutions that shaped post-war America and the international order.