I believe the 2 nations would be like the U.S. and Canada. They would never fight each other again. They would be allies.
If the South had been allowed to secede peacefully--if the Civil War had never been fought--then I think the U.S. could have developed a relationship with the CSA similar to what we have with Canada, or at least Mexico. So that's how I would change history. Another benefit, I think, is that slavery would have died of natural causes instead of being ended by force, and race relations today would be the better for it.
to a tribe of hunter-gatherers. Then there would be a high chance that 40000 years afterwards man would already be in Alpha Centauri. Isn't that why we always win against the AI in civ? We are there from 4000BC after all...
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