Would it not be better to have a peaceful, civil, lawful, separation of the two different Americas than for us to rigidly cling to an idea of a "United" States that no longer represents reality? We're clearly living in two different realities already, brought about the partisan media (on both sides) willfully and deliberately misrepresenting reality to serve the interests of their shadowy trillion-dollar corporate co…
Maybe you're a fan of "Texit".
My big caveats would be freedom of movement, no criminalizing activity that occurs out of state, free trade, freedom of association (no Alabama, you cannot criminalize trade with Massachusets), etc. If you don't like California, you should be free to leave California (without fear of California retroactively increasing punitive tax enforcement against you), and if you don't like Texas, you should be free to leave Texas (even if just to get an abortion in another state and then come back, without fear of arrest or imprisonment).
We are not one identical set of people with one identical culture, one identical set of values, one identical sense of right and wrong. We're 330,000,000+ unique individuals who cluster together, mainly around people like us.
Good gun laws for rural Montana are not necessarily good gun laws for New York City. We should stop pretending that the people in DC always know best for everyone, everywhere. Local communities know what is best for themselves. The more decentralized, the better.