The only problem with the USA right now at a macro level is the amount of power that has coalesced within the Federal goverment. A national divorce is simply nothing more than wanting to split the federal goverment into a blue one and a red one.
If the feds would just get out of our lives and lose control of 85% of what they are doing then each state can just do its own thing AS DESIGNED FROM THE BEGINNING and then that solves that.
The issue is not a division of people but one of who control the country as a whole and that was NEVER supposed to be the case.
Neuter the feds. Problem solved.