"Actually, SCOTUS did not re-define marriage, or do anything even close to that!"

Nonsense.  Your system may be repulsed by the notion that is what Obergeffel did.  But that IS what it did.  Until Obergeffel, marriage by definition included ONLY man and woman.  

And you're right.  It took a Constitutional AMENDMENT to grant full equality to blacks, an immorality that as Jefferson said, was "self-evident."  Where's the Amendment with respect to marriage?  How is it "self-evident" that marriage is for man and man?  Until well past the initial craziness of this post-sixties, post-Christian age, the idea was laughable.

You seriously place slavery on a par with society's restriction of marriage to one man-one woman?  Your notion that they're even in the same league doesn't pass the laugh test.