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

The correct answer is Franklin Roosevelt, who served as President of the United States from 1933 to 1945. His presidency spanned both the Great Depression and World War II, making him a pivotal figure in American history during this tumultuous period. Roosevelt implemented a series of programs known as the New Deal, aimed at providing relief, recovery, and reform to combat the economic crisis of the Great Depression.

During World War II, he played a crucial role in mobilizing the nation for war, forging alliances with other nations, and developing strategies to defeat the Axis powers. His leadership helped reshape the role of the federal government in the economy and society and laid the groundwork for the post-war era.

The other figures listed each served at different times and did not hold office during both major historical events in question. Harry Truman succeeded Roosevelt and dealt with the aftermath of World War II but was not president during the Great Depression. John F. Kennedy and Richard Nixon served in the early 1960s and late 1960s to early 1970s, respectively, far removed from either event. This context emphasizes why Franklin Roosevelt is the answer that best fits the question.