it’s quite a simplistic view. Even in the left side you can have some flavours, so you still have to check how they will compromise and not stab you in the back. We’re in that kind of fucking shit in France right now.
In America, you’re kinda fucked, but worse. If you had elected Bernie Sanders (“left”), maybe you would have a chance, but now you’re stuck with a neolib old geezer (your center I guess, but it’s a bad joke), and a far-right dictator. Good luck with your middle ground…
I assume that when the civilization will collapse, it’s free for all with a little bit of Mad Max.