The survival of US democracy is dependent on whether Trump croaks before his term is up. If he’s still alive when his term is up, he’s not leaving. Then that’s the end of US democracy and either it’s a civil war or they become an authoritarian regime with a slow decline. In which case, yeah they’ll be and adversary for Canada for decades.

But if he doesn’t last the term (he’s old and not all that healthy) my guess is JD Vance lacks the popularity to make authoritarianism stick and will either be voted out or there’d be a coup if he tries to quash democracy. Whoever replaces him would not want to continue the failed policies of that regime.

So it all depends on how long the Fanta Menace lives for.