If the worst happens, we few remaining real Americans should remember the spirit of the Jim Carrey character in mask when it looked like he would lose the fight and possibly him life:
“I hope you enjoy your victory with one freakin’ eye!”
I know that "Red Dawn" was sort of hokey, but muliply that by about 10,000 and one gets the idea of the magnitude of possible resistance.
(It wouldn't be just a few teens with hunting rifles...)