I think, though, that the US won't go full top-down authoritarian, because a large enough portion of the population is armed. Should some kind of coup ever be attempted, it could well spark a civil war – which is still doom, but not a subjugating kind of doom.
Numbers matter. Only a small amount of insurgents are needed to occupy the military, but if even 2% of the civilian population took up arms, the situation would become untenable. All the armed forces together constitute not much more than one million troops. And there would be also conscientious resistance within the armed forces to executive orders to shoot civilians.
https://en.wikipedia.org/wiki/First-past-the-post_voting#Cou...
I think, though, that the US won't go full top-down authoritarian, because a large enough portion of the population is armed. Should some kind of coup ever be attempted, it could well spark a civil war – which is still doom, but not a subjugating kind of doom.