All the southern states had to sign an agreement that they would not ever secede again. So, my thoughts are, get a bunch of conservative states together and say "WE are the United States of America and WE are gonna govern by the US Constitution." Then we vote to kick out all the commie liberal states.
..A good thought, but here we approach the same old misunderstanding. People will be people..left, right, those who would rather hunt than golf..those who prefer Mozart and Chopin over rock or rap.
Some prefer dogs over cats and keeping sheep over keeping cattle. ..And people inhabiting these states..(land masses) are just as diverse
as they can possibly be. State borders were drawn almost arbitrarily..perhaps following rivers, forests or mountains. Some border with straight line borders...seem to have been finished by the stroke of a pen.
A much more accurate map,, rather than being drawn by existing state lines, would be a cultural map pf the USA. Some states can barely agree
with themselves., simply because they are in no way a homogeneous population.
In my view, the best way would be to take the entire US red/blue map and divide it that way..and it would likely work best for the RED politics.
Here's a cultural map, showing the parts where (by color code), the bulk of the population would be in agreement. Then there is the red vs blue map by counties..
But, 'lots of luck'... with accomplishing either move !