You've entirely missed my point.

Bodies that 'descend from the constitution' are certainly constitutionally intended to uphold checks and balances. However this has manifestly failed to happen.

You have a congress deadlocked for decades, 'unitary executive' legal philosophy centralising power in the presidency in order to temporarily pass this legislative deadlock, a senate readily obeisant to the majority party, and a supreme court stacked by the ultra right rolling back civil rights and checks and balances apace. Leading to decision like Citizens United and now presidential immunity.

You have the most recently defeated president still, four years on refusing to accept the results of the last election. A president with a significant base of religious, anti-state and rural poor devastated by decades of drug war and manufacturing decline. A president who openly called for insurrection. He called too on his vice president to overthrow the decision of the electoral college and defended calls to hang him when he did not - https://www.theguardian.com/us-news/2021/nov/12/trump-capito....

The thing tank behind the dominant wing of one of the two political parties in the duopoly has consistently pushed the line that the country is not in fact a democracy at all - https://www.heritage.org/american-founders/report/america-re...

All this against a background of a small class the most wealthy plutocrats vying for power, apparently beyond the reach of legal censure. Plutocrats who between them own all the social networks, newspapers and television stations.

Lets not forget the immense power of the total surveillance state revealed by Assange and Snowdon.

Finally you have the vast disregarded body of the American underclass, sleeping in their millions on the streets. Invisible in Americas view of itself, but inescapable in the tent cities and skid rows that seem now to populate every large American city. The nearly two million imprisoned. An underclass that can be victimised and stigmatised, mobilised and made a boogyman for middle classes all to aware of their own vulnerability in the absence of a welfare state.

As a non-American it seems incredibly clear that the path has been laid for a seizure of power within one to two election cycles. Further, I no longer see a way this can be avoided. Trump if victorious - as he seems likely to be against a clearly senescent party machine president - will likely use every power afforded him by the supreme court to remain in power. I'd expect this to follow the pattern it has followed in every other democracy which has swung to authoritarianism. The rooting out of non existent 'conspiracies' of journalists and political opponents, stigmatisation of immigrants and other minority groups, mass deportations, voter deregistration and the use of external threats to justify controls on movement in and out of the country. The rapid stacking and delegitimisation of the lower courts. The use of an enormous network of mega churches to lend the leader the imprimatur of God. Ultimately paramilitary violence and provoked insurrections leading to a state of emergency and some kind of declaration of a temporary presidency of national unity or similar.

Doubtless this sounds histrionic - but I see no institution strong enough or even truly motivated to prevent it. The only hope I see is that such regimes are almost inevitably unstable and tend to topple within a couple of generations. Eaten from the inside out by ambition and betrayal.