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.
Who should have the power to make that decision?
Do you want a benevolent king at the top that can dissolve parliament, dismiss government, call for new elections, make parties illegal, and censor the press?
Or maybe have something like an electoral college?
Or the army coups, if things get too far?
The ultimate check on power is the people. A general strike, large scale protests, and occupation of public buildings can topple a government. Institutions from military, police, local government, government agencies, and so on value their positions and won’t go down with a sinking ship.