The U.S. President during the Great Depression and most of World War II was Franklin D. Roosevelt. He took office in 1933 after winning the election and implemented the New Deal, a series of programs aimed at economic recovery and social reform in response to the Great Depression. Roosevelt's leadership during the challenging economic times and later during WWII, as he worked to mobilize the country’s resources for the war effort, greatly influenced modern America. He is remembered for his role in establishing Social Security, labor rights, and his approach to foreign policy that shaped post-war America.