From my standpoint as an American citizen of at least 3 generations, I don't think balkanization will be happen here, just because the divisions aren't neatly aligned as of 2020.

Cities tend to be Democrat, rural areas tend to be Republican -- regardless of state. It's not like the Civil War where it was more easily divided.

What's more likely to happen is a full on economic collapse soon. Where things go from there is anyone's guess -- but I don't see balkanization as a part of it. If Trump and team declare martial law and start doing even more human atrocities it might be the spark for WW3. Does that happen before China attacks Taiwan and start WW3?

Regardless of what happens, this is going to be ugly and a whole lot of people are going to die.