The U.S. lent resources like these new B-25 bombers under the Lend-Lease program

CREDIT: Palmer, Alfred T., photographer. “New B-25 bombers lined up for final inspection and tests at the flying field of an aircraft plant, North American Aviation, Inc., Calif.,” 1942. Prints and Photographs Division, Library of Congress. Reproduction Number LC-DIG-fsac-1a35289.