I would gladly welcome New England as our 11th Province and Cascadia as our 12th.
Even better, I would love to see a balkanized USA. The current monster is a sclerotic ossified polity incapable of adapting and changing. They have created such a strong central government that everything is a cosmic battle between 2 megatribes and they all hang from the balls of 3 swing SCOTUS justices, 5 swing state senators and 1 crazy POTUS. That's an insane concentration of power.
The US is just too coupled for what it is. An EU-style semi-autonomous decoupling would make everyone that much happier: when Slovenia adopts weird gender rules, Portugal can just shrug and continue. Hungary gets to cosplay Frankoism while Spain sends ships to protect the Gaza Flotilla.
So, the US could happily break into some sane set of (10-20) self-coherent countries that can freely experiment with their laws, political cultures structures and constitutions. Let's also get an independent Quebec in there for good measure, and let's have an EU-like loose confederation with freedom of movement from the Darién Gap to the Arctic Ocean.
For fuck's sake.