Very good question. The war was not about racism or slavery that was propaganda to stop the English from helping the south. The war was about states rights. The economic undertone was also a driving force for the north. Remember the victors write the history of war.
I am glad the north did what they did because if not England would have taken over a weaker divided America. Then World War II would have had a different ending. So basically the word economy would be different because the main players would all be different.
The world would be no better off…in my opinion