the Supreme Court, the House of Representatives, the Military, the Police, the States, and probably even the Republicans would not accept such a coup détat.
The last four years have taught us (in the U. S.) that institutions are fragile. We wouldn't be the first nation to see our 'secure' government give way to the cult of personality.
Votes are being counted now, as I write. If Trump loses there will be a lame-duck period (until January 23) in which he can work mischief. He has stacked the Court. The Senate is gutless. Even if the Senate majority turns Democratic, there is still the lame-duck session in the Senate, during which that body can endorse Trump's mischief. No blood will be shed. The military will support civilian rule, as it always has.
The House of Representatives will try to put up road blocks. But remember, Trump has been stacking courts throughout the country with judges. As rulings come in to support 'Executive actions', the House will be able to do nothing.
Ok, so this is a nightmare scenario. But it wouldn't be the first time in history that such a thing happened.
RE: US election - revolution? civil unrest? coup détat?