We are too integrated geographically and economically to have a clean split. But some states could secede.
This tragedy aside I'm concerned about bringing in ICE into the cities to provoke a response and then come the troops (regular military) and we're under a military dictatorship. Some people want that. I certainly don't. The killing of Mr. Kirk only foments hatred and the feel for the need of retribution. We don't even know the identity or motives of the shooter, but calling for war against half of the country doesn't seem like a very smart thing to do.