If the United States turned Fascist then it would have used it's large population, exceedingly powerful industrial might, and large navy to completely wipe out the Allies, although they would suffer at first from an inexperienced and small military. read more
If the U.S. switch sides, the Allied powers are deprived of Lend-Lease and it seems likely that the Axis will be able to take and hold north Africa and the middle east and, thus, oil ceases to be the problem that it was. read more
The main Allied powers were Great Britain, The United States, China, and the Soviet Union. The leaders of the Allies were Franklin Roosevelt (the United States), Winston Churchill (Great Britain), and Joseph Stalin (the Soviet Union). The common purpose of the Allies was to defeat the Axis powers and create a peaceful post-war world. read more