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

Franklin Roosevelt was the President during both the Great Depression and World War II, serving from 1933 until his death in 1945. His administration is notable for its response to the economic crisis of the Great Depression, where he implemented a series of programs and reforms known as the New Deal, aimed at providing relief, recovery, and reform to the American economy.

Roosevelt's leadership during World War II was equally significant; he was the Commander-in-Chief during a critical period that saw the United States emerge as a dominant global power. Under his guidance, the country mobilized for war, contributing to significant military operations and eventual victory against the Axis powers.

The other candidates mentioned in the choices did not serve during both the Great Depression and World War II. Herbert Hoover was the president at the onset of the Great Depression but lost to Roosevelt in the 1932 election, while Dwight D. Eisenhower served after the war and Lyndon B. Johnson's presidency followed both of these significant historical events. Therefore, Roosevelt’s unique role in both major crises solidifies him as the correct answer.