Divisions are also fractal. The outskirts of large cities are more conservative than the dense downtown. The center of a small town is more progressive than its outer streets, even in towns as small as a couple thousand people. This isn't the American Civil War of state vs state, it's (relatively) high density vs (relatively) low density.

If we have a wide outbreak of violence it will probably look closer to Rwanda than the organized Union vs Confederacy fighting.