I believe the "divisiveness" will widen to the point where, if someone get into a car accident, instead of good Samaritans calling for an ambulance they will check your political affiliation first by your bumper sticker or license plate #, before deciding if they should help you. At this point cars will need to be equipped with automatic 911 call assist.
People of opposing political affiliations will also speak and dress differently. It starts with choice words, slangs, and MAGA hats and will evolve into dialects, fashion, and schools. We may also face the possibility of splitting the country into two or more opposing districts and contested areas.
The American hegemony will erode and by then, East Asia and Russia will both suffer from demographic decline while Western Europe legalize Sharia family courts. Like the pre-WW1 talking heads who predicted world affairs would continue to be dominated by traditional European powers, their predictions will be turned upside down as new regional powers rise and go to war over declining freshwater resources. Those living in overcrowded and decaying urban centers, Soylent Green comes to mind.
If I'm still alive, you'll find me on a mountain somewhere with reasonably large supply cache, shotgun on the wall next to Twisted Hillbilly girl calendar, busy printing my own dentures on the 3D printer. Small efficient farming drones will be working in my garden, while my kitchen helper 3000 drone will humanely zap a squirrel by the window to death, clean/dress the squirrel and chuck it in the oven with canned mushroom gravy.