General Motors produced vast quantities of armaments, vehicles, and aircraft for the Allied war effort during World War II. Its multinational interests were split up by the combating powers during the war such that the American, Canadian and British parts of the corporation served the Allied war effort and Adam Opel AG served the Axis war effort. By the spring of 1939, the German Government had assumed day-to-day control of American owned factories in Germany, but decided against nationalizing them completely (seizing the assets and capital). Soon after the war broke out, the nationalization came.