This is one of the best analyses I’ve seen to date on what an actual Civil War 2 would look like. It’s political, geographical, and cultural analysis is spot on, although its main weakness is that it largely leaves out social class (which is fragmenting both the Red and Blue Tribe) as well as cultural/social cleavages among the Blue Tribe which are growing exponentially.
An actual Civil War 2 would not be the Red Tribe vs Blue Tribe per se (although that may be an impetus that gets the ball rolling). It would be more like the Lebanese civil war of the late
1970s/early 1980s with dozens of different factions. For example, in some geographical areas showdowns between rival gangs would be just as important as political rivalries. Also, the fragmentation of the state itself would be an issue (or multiple issues).