Most rural towns would be dead in a month if a civil war happened. All those towns produce is meth, teenage pregnancy, and fibromyalgia disability. When the Dollar General runs out of food they will start killing each other.
I can see a few banjo clans attempting to invade cities and set up roadblocks.
The reality of it all is that rural/conservative America is already involved in a proxy civil war with the rest of america. They are using the Republican politicians as weapons to steal our tax dollars and funnel it into their failed existence while they pretend their gasoline corn is something good for the world.