Well, it depends on how you define the USA. You mean the Republic of the United States of America? Yeah, no, that's dead. It is currently dead. It died when the SCOTUS made the president functionally beyond criminal prosecution, and everyone has just kind of been playing weekend at Bernie's since then (though the Trump administration is dropping the pretense pretty quickly). Don't get me wrong, it's been dying for a long time, but that was the exact moment it was declared dead. No matter what happens, the republic as we knew it is dead and is not coming back. Nobody believes in the constitution anymore; among our leadership there are only either those who are in a hurry to destroy it, or those who are unwilling to defend it. I think a lot of the American populace haven't sincerely believed in the constitution as an effective charter for governance for a while, too. Imo, we're less than a year from the legislature being dissolved in some fashion of another, unless they just hang on like some ceremonial vestigial organ.

What we get to decide now is what comes next. That's what nobody's sure about. Are we going to have a middle-east style theocratic government? Italian fascism? Maybe the military defends the constitution from all enemies foreign and domestic and we re-form the republic? German fascism? Neofeudalism? Peaceful balkanization? Hot balkanization? COULD IT BE?! BY GOD, it's the ghost of Lenin with a steel chair! Or maybe we'll get something entirely new? It's frankly impossible to guess while we're living in it. I think cold balkanization is both the most likely and most optimistic scenario. IN THE MEANWHILE, yeah, you're still going to see all the window trimmings of the USA; the maps will still say USA, we'll at least nominally still have the things that make America America (like the constitution still sitting in its fancy protective case, as though the GOP didn't just wipe Trump's ass with it), it'll all look weirdly normal while they make the republic's corpse do a funny little jig.