Nice series of logical fallacies you've got going on.
The north went to war to save the union; the south went to war to save slavery. The north ended up fighting to save the slaves; the south ended up fighting (and losing) to save their confederacy.
Save the Union from all those Southern States that wanted to have an seperate POLITICAL iteration... Yes!!! Kill them all!!! Monty Python couldn’t have created a more absurd skit than the Civil War. The South WAS the Union, as was the North. You don’t kill your wife because she wants someone who doesn’t cheat. Think man!!!