Less so than a leftist case for it just an inevitable thing thatll happen. The US is big, and divided. The elites might be united in the uniparty but the people arent. Imo there will be an implosion as the empire collapses and the federal government will partially collapse. Youll probably see an initial fascist takeover of things and then as people tire of fascists there will be regional secession movements led by marginalized groups. Climate collapse will just make this worse. Idk what the borders will be but i can almost garuntee it wont be state borders, or national borders. Itll be messier.