Franklin Delano Roosevelt served as president of the United States for 4,422 days, making him the longest serving president. Roosevelt died on the 83rd day of his fourth term on April 12, 1945.
Roosevelt became the 32nd U.S. president in 1932 at the height of the Great Depression. Roosevelt ushered in several economic recovery measures during his tenure that became known as "The New Deal." The United States entered World War II during his unprecedented third term. Early in his fourth term, Roosevelt died of a massive cerebral hemorrhage at the age of 63. In 1947, Congress passed the Twenty-second Amendment to the Constitution, which set a two-term limit for election to the position of president of the United States.