How might the war have gone differently had Japan not attempted their strike at Pearl Harbor until December 7, 1942? For all intents and purposes we can assume that they didn't take any direct military action against Britain or the Soviet Union until then, and so are effectively at peace with the Allies until then. How does the war in Europe go differently with an American involvement delayed by a year? Does America perhaps join anyway, and if not do they step up help to Britain in ways we didn't see in our time? And would Japan even have been capable of a strike from an economic view by this point?