The US Civil War wasn't even fought to end slavery. That's a jingoistic talking point that "patriots" like to tell themselves that has absolutely no basis in reality. But "discrimination?" That's pure, unadulterated idiocy.

The war was fought to put down a rebellion by Southern states who refused to modernize because they used slavery to maintain their representational numbers in Congress. The Emancipation Proclamation wasn't even enacted until year three of the US Civil War, but the Southern states saw the writing on the wall and decided to act while they believed they still had time to do so.

The rebellion was the important thing to the North.