I'm sort of interested in "Civil War", but I'm a lot more interested in the idea of nonviolent revolution in the USA; that is, a discontinuous change in the rules of government based on popular demonstrations.
https://en.wikipedia.org/wiki/Nonviolent_revolution?wprov=sfla1
I think there are some real logjams in our federal and state systems, including gerrymandering, campaign finance, the filibuster, the size and composition of the Supreme Court, the fixed size of the House of Representatives, and the consequent disproportionate representation of small states on the Electoral College. We have the tools to correct them, but there are feedback loops that make it hard to do so.
@tuban_muzuru I disagree. Growing the House stopped in the 1920s. The filibuster has existed since the 1830s or so. There are just a lot of ossifying effects coming together all at once.