How did President Franklin D. Roosevelt move the United States away from isolationism?

President Franklin D. Roosevelt navigated a deeply isolationist American public by gradually expanding U.S. involvement in World War II through strategic policy shifts and public persuasion.

Key actions included:

• Neutrality Act Revisions: In 1939, Roosevelt persuaded Congress to repeal the arms embargo, allowing Britain and France to purchase munitions on a "cash-and-carry" basis.12
• Material Aid: Following the fall of France in 1940, he transferred 50 overage destroyers to Britain in exchange for naval base leases. He later championed the Lend-Lease program, which allowed the U.S. to supply war materials to the Allies without immediate payment, famously framing the nation as the "arsenal of democracy".1342
• Regional Defense: Roosevelt expanded the U.S. security perimeter by occupying Iceland and authorizing the navy to escort convoys and attack German submarines on sight, effectively engaging in an undeclared naval war.132
• Diplomatic Alignment: In 1941, he met with Winston Churchill to issue the Atlantic Charter, establishing shared democratic war aims.513

While Roosevelt publicly promised to keep the U.S. out of "foreign wars," he simultaneously prepared the nation for potential intervention.132