Which president served during the Great Depression and World War II?

Franklin D. Roosevelt served as the President of the United States during both the Great Depression and World War II. He took office in 1933, at a time when the nation was grappling with severe economic challenges due to the Great Depression. Roosevelt implemented a series of programs and reforms known as the New Deal, aimed at economic recovery and social reform, which were pivotal in addressing the economic crisis.

As World War II began, Roosevelt's leadership continued through this period as well, from the attack on Pearl Harbor in 1941 until his death in 1945. His administration was marked by significant military and homefront efforts, including the establishment of key alliances and strategies that contributed to the war's eventual outcome. Roosevelt's involvement in both major historical events underscores his critical role in shaping 20th-century America, making him the correct choice for the question regarding his presidency during these significant periods in history.