Not likely. At all. The crux of the problem here is that the main issue politically is a urban vs rural divide, so breaking it up on state lines isn't going to work but even entertaining breaking it up state by state, this map doesn't work.

AZ and NM would probably lock in with Pacifica, you need ocean access as a nation and they are the better economy to hitch your star to so to speak. Co also swings blue, so they are also likely to go that way.

NC and Georgia join up with the east coast, GA votes blue with a few exceptions and so does NC. They aren't going to hitch themselves to the new america. SC is such a non-entity economically that they'd probably flip just to keep up the tax incentives that new england could afford.

If anyone goes alone it would be Texas, and they would.

Next you'd see all the big cities trying to break free of the 'new america', so places like Cleveland are going to do anything they can to get out of the red states, border cities would have a reasonable time of it. . Literally any city is going to want to get clear of New America.

Ohio's big 3 C's (Columbus, Cincinnati and Cleveland) are all overwhelmingly blue, and would likely have massive issues joining this new US of MTG. Realistically, Ohio shatters in this scenario with Cleveland joining up with the New England states, Toledo joining up with Michigan, and Columbus trying to break free but probably failing and there being an absolute mass migration out of there. Gary Indiana is going to try to stick to Chicago, they don't make sense otherwise. Pretty much the whole shoreline over there is full of people who work in Chicago/Gary and they are going to want to stick with Chicago.

Other issues include things like Rural NY is largely red, as is most of PA, just most of the population lives in cities that are blue.

Texas is going to stand alone if the nation divorces as New America will drain it dry, and if they are removed from New America that nations economic prospects dim considerably.

The short of it is dividing everything by state lines isn't going to work here. It would be more a west virginia situation where everyone starts bailing to join up with the side they want.

So what I actually would expect to happen is Ohio loses the Cleveland/Elyria corridor to the New England government because they don't like how the GOP is managing the state already, then the 'new england' government would probably bribe Toledo into shifting over, and you'd have a continuous land based nation containing all of New Canada and New England, plus Georgia and the Carolinas (again South Carolina would be bribed)

Pacifica includes 'New Mexico' and Colorado. Texas stands alone.