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

The correct answer is Franklin Roosevelt, who served as President from 1933 to 1945. His leadership during the Great Depression was marked by the implementation of the New Deal, a series of programs and policies designed to provide relief for the unemployed and stimulate economic recovery. Roosevelt's presidency also coincided with World War II, during which he played a crucial role in mobilizing the American economy and military to support the war effort, forming alliances, and planning for post-war recovery.

This context highlights Roosevelt's significant impact during both major historical events. His ability to navigate complex domestic and international challenges helped to establish the role of the United States as a leading power on the world stage by the end of the war. The other options represent presidents who served during different times; for example, Harry Truman succeeded Roosevelt and took office after World War II had started, while Dwight Eisenhower and Lyndon B. Johnson served in the 1950s and 1960s, well after both events had concluded.