Who was the policy who was letting Britain borrow war supplies?

The policy that allowed Britain to borrow war supplies during World War II was known as the Lend-Lease Act. Initiated by U.S. President Franklin D. Roosevelt in March 1941, this program enabled the United States to provide military aid to foreign nations during the war, primarily benefiting Britain and its allies. The act signified a shift in U.S. foreign policy from isolationism to a more interventionist stance in support of nations fighting against Axis powers.