Sugar was the first food to be rationed, in the spring of 1942. The war with Japan cut off U.S. imports from the Philippines, and cargo ships from Hawaii were diverted to military purposes. The nation’s supply of sugar was quickly reduced by more than a third. To prevent hoarding and skyrocketing prices, the Office of Price Administration issued 123 million copies of War Ration Book One, which contained stamps that could be used to purchase sugar. No sugar could legally be bought without stamps, and sugar rationing would continue until supplies returned to normal in 1947.