“More people and more money and more stuff means a larger, better equipped army. If it really comes down to violence, look to dissenters being driven out of the sparsely populated rural counties of the Democrat states and their place being taken by transplants from the cities.”
I’ll put my money on the gun owning, freedom-minded, know-how-to-grow-and-fix-things country folk over the metrosexual city idiots who can’t do anything without a cell phone. Just get the blockade lines established quickly and enforce them ruthlessly.
The US military plays a bigger role in this than either group. Timing is also important, as are public perceptions. I can imagine freedom-minded folks trying to quickly establish and ruthlessly enforce blockade lines getting the hell shot out of them.