Didn't the south try this, before being forced back into the "union"?
True, that was an awkward episode. Now you've got me reading about the motivations for the civil war. I mean obviously slavery, but why go to war rather than let the Confederacy be a separate nation? Seems the fighting was over the political future of yet-to-be Arizona, New Mexico and Oklahoma (if I've got the right territories there), and whether they would have slavery, once populated.