>>64143047
>Could it survive such a scenario?
No.
Though nobody else does either so let's call it a draw.

If you take nukes off the table (because China and Russia are in play) and used a realistic (lol) scenario like say, the global south AKA juntas & dictatorships, they could zerg rush the USA and while taking horrific casualties, probably make land and then even Chink conscripts are probably going to have an edge on good 'ol boys behind every blade of grass, if only because PLA and Norks provide more training than a mobik gets and good 'ol boys haven't shot at anything that shoots back before.

If the USA has some vundervaffen, say loitering tethered sea bed mines off every possible beach-head that are super classified, or orbital death rays that fry every landing craft beyond swimming distance of shore, then yeah, they possibly survive.
I think the USA can probably fight off the collective regime airforces eventually, only the numbers give them trouble, not the technology.

This scenario overlooks that the USA, while fucked up, is a member of the global west and the west is not going to sit idle while the world's arseholes line up to take a swing at it.
You saw what the western world did after 9/11. The same would happen again.
Yes, the USA is our retarded, racist uncle at the BBQ but if some fascist fuckstick decides to shiv him for his wallet, we're going to come to his aid. He's not going to be alone.