Who served as President during the Great Depression and World War II?

Franklin Roosevelt served as President during both the Great Depression and World War II, which makes this the correct answer. He was in office from March 1933 until April 1945, navigating the nation through one of its most challenging economic periods and leading it into the global conflict of World War II. His New Deal policies were crucial in addressing the economic hardships of the Great Depression, implementing reforms and programs aimed at economic recovery and relief. Simultaneously, he was instrumental in the U.S. response to World War II, shaping military strategy and working with Allied leaders. This historical context highlights his significant impact during these critical events in American history.