Could the Japanese have invaded the US?

[RedDevil]

You left out the 1 thing that would surely prevent a large scale invasion of any success and that is Americans, armed with guns and lots of them..
I don't think even the US military at that time would have been able to control the swarms of gung ho farm boys and their cousins making a mass exodus across the country.
Hell.. half of Chicago owned Thompson SMGs..
My grandfather left us with a 30 gun collection when he passed on... I'm still using his shotgun for hunting to this day.

The Attack on Pearl was enough to incite an entire country, that just a few years prior, wanted to let the rest of the world deal with it's own problems.
The patriotism of that generation will never be matched in terms of total commitment and determination in following thru to the finish.