The US Military has spent ten years wearing out its combat troops trying to pacify a country the size of Texas, opposed by goat herders and drug smugglers. You think that a military that is fractured by domestic conflict would be able to control an area 14x as large if there was a widely distributed insurgency sparked by some egregious violation of the constitution? Dream on.
The key word there is pacify. We certainly have the weapons technology to allow us to just kill everybody there (and let God sort them out, I suppose), it's trying to avoid collateral damage, human fatality-wise, that makes things problematic.
But we aren't as tribal here in the States, and in a situation where the actual military was unleashed domestically, neighbor would be more likely to give away neighbor, especially if the alternative was having the entire neighborhood reduced to dead bodies and smouldering rubble just to get the guys in one house.
And our military has the firepower to do that to an entire neighborhood, and then another, and then another....
If it gets to the point domestically that due process and all that is out the window, the civilians are outgunned, because they can't afford their own air force, or a navy that can sit offshore and bombard them from miles away, etc.