I strongly believe a coup could never happen in the US. Why? The average American has too much to lose. Revolutions generally happen in places where the people either have nothing much to lose or very much to gain, and middle-America (which would have to participate for any chance of success) simply has too much to lose. Even with things not being as good for the average American as they could be, things are not so bad that they are willing to support such an act. Impossibility level is exceedingly high. It would be literally easier for Zambia to fund a mission to Mars.
.......you make good points but the word “coup” connotes “military” and our West Pointers and Annapolis guys have zero experience mentally with that concept. It is kinda sorta like the Chinese Navy that everyone wrings their hands over all the time. They don’t have any experience either. You could give them 10 Nimitz Air Craft Carriers along with the air wings! What good would it do them? They could not operate them! What “War in the Pacific” have the Chinese ever been involved in, in the past 1,000 years. Our guys have that non trnsferable naval combat experience, the Chinese don’t. They can steal all the plans to all the complicated systems they want but, most of the time, they could not operate them. Similarly, our guys have no experience with “coups”. Contrarily, the Chinese have regurgitated their leaders fairly regularly over the past 1,000 years.