Assuming for the sake of argument that the U.S. did Balkanize, or did suffer Civil War II, it'll be a friggin' mess. County by county, with very unclear lines of engagement, if any.
Some state like Texas probably would be able to put effective strangleholds on the liberal enclaves in the large cities, and others like the Northeast will be suitably leftist, and moderate RINO that trouble doesn't get brewing.
Places like Wisconsin, Michigan, Ohio, and Illinois... total ****-storm.