(Sorry if this has been asked already, which I'm quite sure it probably has. >.>;; )
Isoroku Yamamoto wasn't going to kid himself about the situation in the Pacific, he knew that the only real way to ensure victory against the US would be to, in his own words, "march into the Washington, and dictate the terms of peace in the White House."
While he may have said this with some reservation and caution, I'm left to wonder what would've happened if the Japanese HAD attempted to invade the US. Specially at the onset of their offensive, when America was still reeling a bit from the Pearl Harbor attack, and had yet to actually begin building up for war.
Where do you think they would've staged their invasion beachhead? What part of the country would've been the most logical staging ground? Would it have been successful? And if not, how far do you think they would've been able to get before being thwarted?
Would Germany have eventually gotten itself involved in this? And lastly, what would this mean for Japanese-Americans caught in the middle of this?