Cut to the Chase

 I tend to get to the end game of things pretty quick. I rarely feel the need for gradual ramp ups to energize yourself under the guise of allowing space for escape valves. If you're ready for the end game and fully accept it then the process of a mutually agreeable exit becomes easy. But there is no dallying around one-sided exits while the other side subterfuges. 

For instance, it's been since at least 2010 when I figured US civil war was going to be inevitable. The main question is whether it would take a mob based tit for tat, or whether it would be predominately a targeting assassination affair.

Now that everyone is waking up to this fact, we've got until Jan 2020 to figure out what to do. It will take a few months for the mail-in ballot fubar to work itself out. During that time you'll have a HUGE number of protests and counter protests with violence levels graudually increasing each weekend. Just like the Kenosha - Portland tit for tat, each side will fight for its legitimacy to occupy space and maintain a grip on its right to exist within the public sphere.

But, nothing will settle this down.

The only real option is to decide how to parse up that nation so that BLM/Antifa progressive cultists can comfortably exist in their space and Trumpist conservatives can exist in their own.

To that end you'll probably need an amalgam of states that start going by their own set of rules. Those rules will be very draconian for outgroupers. You'll have a lot of intimidation based emigration. That's similar to the sorting that happened during the Patriot-Loyalist conflicts in the war of Independence. It will also mean watering down Federalism. That is going to be very hard, nay impossible to do. Systems don't like to give up power, and I don't think the Judiciary is liable to give up any of the righteous rule.

That functionally means finding a way for the mid-west and south to have good port access. While I'm no expert, the Caribbean is poorly suited to this end. That means the crux of things will be the Carolinas and Virginia. But it also means finding a way for East coast puritanism to function as a political entity with West coast fundamentalism. That is hard.

There's also no easy answer for what to do with Washington. It's the Federal seat of power but is clearly in the boundaries of the progressive sub-nation. There may be no real way to get rid of Federalism's overpowering nature without giving up most of Washington's current physical role.

OTHER OPTIONS

The only other option is to explore the limits of City state power.

The current conflict can be well characterized as an overgrowth of city state size and power. Rural California, Oregon, Washington, etc. have very different politics from their city centers. Much of the over step of city center power is based on the deference outsiders give to the rule of law.  With the social contract now irredeemably broken (with the realization of such only slowly dawning on people), there will be a functional limit to how far cities can pressure their rural residents.

I don't think this polity size change is viable though. It is too many units of selection down from where polity size is currently stabilized at within our population.