Depends on a lot of factors.
This thing wouldn't be formations of rednecks marching down the road or any other type of regular warfare our military would be able to easily deal with. It would be more like an insurgency with hit and run attacks, car bombs, sabotage, etc. We saw just this week how somebody can set off a bomb in the middle of a major city center. How are the police going to deal with a network of loosely aligned cells of domestic terrorists of 3 or 4 people and a underground network of a few hundred people who are willing to help them hide? Eric Rudolph was able to hide in the North Carolina hills for years because he had local support, and he was the most wanted man in the country and we had a decent idea of where he was.
Look what one man with some rifles, a supply of ammo, and an elevated position was able to do in Vegas. Look at how much chaos of the DC snipers or Christopher Dorner did with minimal armaments. The DC guys were able to paralyze DC for three weeks and Dorner had the LAPD having to travel in protective details, took their motorcycles off the road, and so scared they were shooting at anything that went boo for nearly 2 weeks. Neither of these examples has larger support networks or used serious firepower like bombings.
Marvin Heemeyer built a tank in his garage and used it to destroy half a town before police were able to stop him. The only reason they did is because of luck. Heemeyer didn't provide enough protection to the radiator and it was damaged and he got stuck when one of his tracked fell into the basement of a building he's run over. He killed himself, but had he wanted to cause more destruction he probably could have if he'd taken something like that into his plan. It was so bad that the Governor of Colorado was about to authorize a missile attack from the National Guard, but stopped short when the tank got stuck.
That's just a few examples, but imagine if a few of these things were happening at once. Think of a situation where there are 3 or 4 snipers operating throughout the city. At the same time there are random bombings happening as well, not Nashville bombs, but smaller bombs like in Boston going off in a Wendys or the food court of a shopping mall. Or they set a bomb in a trashcan the night before and then a sniper shoots a cop there the next day. When the police roll up in force like they do, the bomb gets set off. Maybe somebody flys a drone with a bomb attached into a crowd.
Everything I just said together would cause complete chaos in a city. People would be panicked including the police. What happens when the police mess up and kill an innocent person? Is it going to set off protests or even riots in response? Probably, which would strain police further and provide both cover and opportunities for insurgents to either attack or inflame....probably both. Oh, and all of this is able to be accomplished with a group of what, maybe a dozen people?
Do police eventually get the upper hand possibly with military assistance? Yeah. In the meantime the city is turned upside down and massive loss of life and property is possible and the situation after is much less stable. Now imagine that happening in 5 or 6 cities across the country at once.
That's just one scenario that doesn't require anything that I couldn't imagine these groups getting. Basic and widely available firearms and access to explosive material. The hardest part to come up with would be planning with operational security to not get caught before it starts and people with the expertise to build the bombs. Unfortunately there are plenty of those people out there.
If anybody wants to think about it in a lot more detail from a person with a lot more information and knowledge on this than me....you should check out this podcast on the subject.
https://www.iheart.com/podcast/1119-it-could-happen-here-30717896/
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