My guess would be start with Texas and annex adjoining land as local conservative populations succeed from their counties and states (e.g. Missouri minus St. Louis, Illinois minus Chicago, Indiana minus Gary etc).
We’ll need a route to the sea, preferably two (take the St. Lawrence seaway via Wisconsin, Upper Peninsula and northen New York), raw materials, energy (mainly nuclear), arable land and millions of hard working, self-reliant patriots. Eventually the liberal areas will shrivel and die (see Detroit) and beg us to reconstitute them. Maybe in a 500 years after all the garbage is bred out of what is left of their un-civilization.
Would it be easier for countys to join other states vs. states leaving the union?
I think we could split the red states up and take an iron grip over the senate!