That’s very much the issue. Some states will want to leave, but the Feds won’t leave them in a state of secession. In that sense, it will be exactly like CW1.
It will also be like CW1 in that it will happen by state, not e.g. by county or shoe-size.
But the article writer is correct in that the cities - all cities - will be havens of federal support, and all rural areas will be havens of secessionist support. That I guess is a big difference from CW1.