Which President served during both the Great Depression and World War II?

The President who served during both the Great Depression and World War II is Franklin D. Roosevelt. He took office in 1933, specifically during the height of the Great Depression, and he implemented significant policies and programs to combat the economic crisis, such as the New Deal. His leadership played a pivotal role in stabilizing the American economy and providing support to millions of unemployed citizens.

Roosevelt also served as President throughout World War II, which began in 1941 for the United States after the attack on Pearl Harbor. He was at the forefront of key wartime decisions and strategies, working closely with Allied leaders to assist in the fight against the Axis powers until his death in 1945, just months before the war ended.

Understanding this context is important because it highlights Roosevelt's significant impact on both the economic and military history of the United States during critical periods in the 20th century. The other individuals listed did not serve during both of these significant historical events, making Roosevelt the definitive answer.