I get he states rights part. But the slaves wouldn't have been freed...lets not pretend that the Civil War was at least partially about that. There would have been no Emancipation Proclamation...or fast forward 100 years no Civil Rights Act or anything of the kind.
There would have been no dead 750,000 people, no FedZilla currently operating far beyond it's constitutional boundary, and no century of economic destitution in the South. The nation would also have missed the age of Robber Barons and the Massive corruption in the aftermath of the civil war.
Are you saying that had the South won, you'd be fine with slavery still being around...Jim Crow Laws in effect and no Civil Rights Act of 1964 because of States Rights?
Slavery would have lasted between 40 and 80 years longer had the South won. Had the South simply remained part of the Union, slavery would have lasted between 40 and 80 years as well. The economics of it wouldn't have worked longer than that, and the social opprobrium was only going to get worse over time.
The only way slavery ended as early as it did was because a man exercised the power of a tyrant to destroy the people who wanted independence. Slavery was ended more because it benefited the political power players in the Boston/Washington corridor and for revenge than for any other reason.