You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Looking at this thread https://www.alternatehistory.com/Discussion/showthread.php?t=330872 made me pretty in the idea. So the challenge is to make the north and south separate countries after the revolutionary war. It can't be after the Louisiana purchase. And if it does happen what happens afterwards?