Who was President during the Great Depression and World War II?

Franklin D. Roosevelt served as President of the United States during both the Great Depression and World War II, which makes this the correct choice. He assumed the presidency in 1933, during the peak of the Great Depression, and his policies, known as the New Deal, aimed to provide relief to those affected, stimulate economic recovery, and reform the financial system. His leadership spanned the majority of World War II as well, as he was in office from 1933 until his death in 1945. Under his administration, the U.S. took critical steps in military mobilization and international diplomacy during the war, establishing him as a prominent figure in American history during these transformative events.