The U.S. president during World War II was Franklin Delano Roosevelt (FDR). He served as the 32nd president from 1933 until his death in April 1945, leading the nation through both the Great Depression and World War II
. Roosevelt initially maintained U.S. neutrality but supported the Allies with programs like Lend-Lease before the U.S. officially entered the war after the Japanese attack on Pearl Harbor on December 7, 1941
. As Commander-in-Chief, Roosevelt worked closely with Allied leaders Winston Churchill and Joseph Stalin to coordinate the war effort against the Axis powers
. After Roosevelt's death in April 1945, Vice President Harry S. Truman succeeded him and saw the war to its conclusion later that year
