Sooner or later at least one of the crazier states such as Texas and Florida will push things too far, with either the support, the disdain or the active opposition of the POTUS, House and Senate of the day. It is a matter of having too many whackos and too few politically and ideologically sane minds living in close proximity.
Once the crazies roost in sufficiently strong numbers, the ellected officers will reflect their composition and increasingly stronger measures will have to be used to keep some modicum of sanity and functionality. Eventually the people themselves will either embrace the crazy to the point that the sane ones will just leave, or some form of tragedy will happen and hopefully bring enough people to their senses.
Best case scenario, one of those states pulls a Brexit of sorts and convinces enough people both nationally and locally that it is for the best to formally secede, unthinkable as that may feel for many at this time. The end result will be a lot of expensive, slow litigation and quite a bit of exodus from crazyland. The economic situation will unavoidably deteriorate there, as will the political discourse. It will have its run-in with fascism and learn the bitter lessons that come from its eclosion, albeit at a very high price. People will speak of that cautionary tale for at least forty years after fascism deplets itself. The other states will learn from that as much as they truly want to, and some pockets of daring political awareness and innovation may well develop somewhere in the USA. If we are all lucky, at some point during that daytime nightmare it will be noticed that the USA are suffering from their own mythology and it is time for meaningful change in both system and myth. Some form of Parlamentarism may well arise. The frequency and intensity of verbal ideological clashes will have to intensify considerably from the current level before it can find some form of resolution, which will no doubt be painful.
All that hatred given so much free reign has been harming the possibilities of the USA and it will continue to for decades to come. It may easily never regain the global influence and respect that it once had. I estimate that it will be some twenty to thirty years before it fully realizes that it has lost its way. Some measure of brain migration to Canada is bound to happen. During those forty years or so a lot of effort will be put into spin and optics, because human nature is just like that.
I don't expect a civil war as such, but rather a lot of political and economic stagnation and hardship as the disease runs its course through the political and ideological tissue of the USA. House and Senate will probably become quite the circus for many years to come. The GOP will... I guess it will just keep reeking and putrefating. It has incredible skill at doing that and there is no reason to expect that it will stop any time soon.
