Earlier quoted context omitted.
As a note there are 20 million ex military in the US, most of which are armed. So the US civilian population has an out of shape military with small arms at around 10x the size of the standing military.
That's assuming they side with the civies and don't rejoin the standing military. Truth is, we have no idea what a US civil war might look like. There would be military defections as well as citizens joining the government. With no understanding of what the factions would look like, it's difficult to forecast blindly (not that you couldn't make projections based on certain groups leading the antagonists side and how…
A demonstration like happening in Hong Kong likely wouldnt ever happen. I use the nevada rancher incident as an example.
Govt agents backed down from armed "militia" to avoid the bloodshed.
https://en.wikipedia.org/wiki/Bundy_standoff
Govt agents