@Akaj you raise excellent questions, especially points #1, #2, and #4 which I genuinely do not have a good answer to, and I await the input of Dopers who are more knowledgeable on those areas. What I can say is that a peaceful dissolution is not impossible, just look at the example of Czechoslovakia. If Republicans are firmly behind secession and Democrats recognize that their political survival hinges on letting the crazies split off, the political will can exist for amending the Constitution to allow the red states to do just that.
I presume trade will still be carried out between the two (or more) newly formed countries, so cars and planes should still be able to go through. I can’t imagine that a country would be so vindictive as to restrict their airspace and highways just to be douchey, I mean, the red states already got what they wanted by leaving the big bad blue states right?
As this is one of the topics I am more interested in, I have collected some Dope posts that discuss the multitude of issues that can crop up during and after such a secession. (1, 2, 3)
That’s because the North wanted the South to remain in the Union. If both Democrats and Republicans are in agreement that red states need to go, this isn’t a problem.
My stance is that if enough people across both parties agree to amend the Constitution to allow for a peaceful dissolution, take the deal and run! We can always hash out the issues later. Perhaps let adults choose which country they want to be citizens of, but that could run into the problem of a country refusing to allow high net-worth individuals leave for the other country.