A- The United States passed the Lend-Lease Act to provide military aid to the Allied Powers.
Prior to Pearl Harbor, America took a "neutral" stance. I say "neutral," because they were Allies-favored. They passed a series of laws that gave indirect support to the British, allowing them to help the Allies while keeping their "neutral" stance. After Pearl Harbor, though, an enraged United States would take up arms with the Allies in the fight against the Nazis.