You’d think a hegemony with a 100-years tradition of upkeeping democracy against major non-democratic players, would have some mechanism that would prevent itself from throwing down it’s key ideology.
Is it really that the president is all that decides about the future of democracy itself? Is 53 out of 100 senate seats really enough to make country fall into authoritarian regime? Is the army really not constitutionally obliged to step in and save the day?
I’d never think that, of all places, American democracy would be the most volatile.
Impeachment. That’s it.
But you’re also forgetting that in the US states have a significant amount of power. For example the President cannot cancel elections. If a state cancels elections they just don’t get counted.
There’s a lot in that particular area that shields people from federal government stupidity.
They can ignore election results though, or fraudulently certify them.