We have some very good allies on our side.
Japan is key. They are a model culture, even a place one may flee to once America is overrun.
India will further awaken - they are already quite civil, largely. (Such a complex country though, their dynamics aren't clear to me...)
India and Japan are among the most racist and xenophobic cultures on the planet. You want a good ally? Try Poland.
Yeah, but the Asians are smart enough not to let too many foreigners in.
If China ever completely dumps Communism, it'll be almost unstoppable. China, Japan, India, South Korea....that area will be the world center of economic & military power in 2100. America peaked in the fifties. Sixties liberalism started us down the path of destruction.
If you think that Japan would be open to American immigration and/or that they'd be accepted, you need far more help that you can get on line.
You won't be welcome in Japan they have the common sense to value their culture, unlike 'we' dummies opening the door to the third world, come one come all. If the west goes down it will bring it upon itself and will deserve everything it gets. Just look around you, if push comes to shove, do you think they will fight? will they put all the liberal/conservative crap behind them and fight? Yeah it's scary, glad I'm getting up there!
Japan does not accept immigrants. They preserve their national culture and identity. So, don't count on moving there.