Unless of course the Supreme Court decides otherwise. 
Nor does one get to a colony of Great Britain and then back out.
Then let’s give – oh, Rhode Island or better, Samoa! – to the dumbasses and let them go nuts is their little world.
I think I read somewhere that global warming is going to threaten the very existence of Samoa. There would be a delicious irony if the nutcases kept denying it until they had to start treading water. Let ‘em build a funckin’ ark.
I’m pretty sure that didn’t work quite the same way.
Yeah, nobody’s doing that.
Much though we might like to fantasize about it, it would mean the death knell for all of the states. Even after the split, some new issue would arise to divide the new nation, and you’d get a new two-party system. And in the first election after this new schism, you’d get some “green states” and “orange states”, or whatever, and whichever side lost, those states would then follow the precedent of Texas, and would split off so they could get their own way. Pretty soon, there would be no “United States”, and we’d all hang separately.
No, it did not.
It depends upon who wins.
Excuse me? What makes you think the RSA would be responsible for any of the USA’s debt? That’s like saying that the RSA gets “its share” of the USA’s armed forces hardware - that’s not going to happen either.
It would be like any other “we want to make our own government” move; they’d want to retain every beneficial aspect of being a US state while being able to say no to federal demands, no matter how contradictory or self-cancelling those positions might become.
It’s like small towns that have gone Libertarian or Communist or whatever: they can play at being “totally different” while surrounded, supported and succored by the US infrastructure. None would want to raise their own militaries, be self-sufficient economically, or in general deal with the issues of being a free nation; they’d just want to take all the candy up to their room, play video games all night and tell Mom and Dad to get stuffed.
And in the end it would be “meet the new boss… same as the old hoss('s ass).”
The RSA is in physical possession of more than its share of the military facilities, at least.
Why? Is the Queen gonna reconquer us state by state?
The seceding states would be invaded by the US government and occupied for several years. Nuclear bombs will shake the Earth. Millions would die needlessly. A century and a half later, statists will build a monument for the presidential invader next to the Lincoln Temple in D.C.
Canada could pick off small northern states one by one. And what’s to stop China from colonizing Los Angeles?
For one thing, they’d still be making a lot of spelling misteaks. 
Or, at that point, the BSA could invade the RSA, exterminate the population and settle the territory, in the finest tradition of both Americas!
If by ‘pick off’, you mean allow Maine to respectfully petition the Queen, her representative the Governor General, Parliament and the Prime Minister for inclusion in the Dominion of Canada, sure.
“Occupy first, petition later, eh” will be their slogan.
Or does Canada seriously have some sort of no-aggression clause in their constitution?
The Mexicans’ dibs.
Mexico gets San Diego County, and everything east, Arizona, New Mexico, and Texas. China gets LA and everything east and north of there.
Dividing line will be through LegoLand in Carlsbad, it’ll be the coolest DMZ on the planet.
Shouldn’t it be New Republican America (NRA) ?
I’m having trouble finding anything resembling total agricultural yield by state, but what makes you think the BSA would have any problem feeding itself? California has a huge agricultural yield, and most of the major corn-producing states are blue as well (Iowa, Ohio, Illinois, Minnesota). Upstate NY and Washington State also have large agricultural regions. Sure, there’s a shortfall of wheat, but that could be exchanged for things that the red states don’t grow.
Good riddance.
You can get lost in neighboring New Hampshire and wander into Canada.
Thank goodness they are a bunch of nice guys and not East Germany.
Besides, it’s damn cold up there where my Ex Wife comes from.