Answer
It lent arms to Allied forces and allowed them to pay later.
Explanation
The Lend-Lease Act was the principal means for providing U.S. military aid to foreign nations during World War II. It was a program provided for military aid to any country whose defense was vital to the security of the United States. The plan thus gave Roosevelt the power to lend arms to Britain with the understanding that, after the war, America would be paid back in kind. Lend-lease was important because it advanced the United States to the edge of war. This was by providing that the president could ship weapons, food, or equipment to any country whose struggle against the Axis assisted U.S. defense.The president Roosevelt signed the Lend Lease bill into law in march 11th 1941.