The number of people who are against mixed raced marriage so much they would ban it via government action is tiny enough that we could call the matter "settled". Even if people don't like it, most of them don't want to do anything about it except sneer at it and maybe disown their kids if one of them ever enters into one.
For abortion, you have a sizable portion of our country that would LOVE to overturn Roe v. Wade (including ironically, Roe).
A guy walks up to the beautiful blonde and asks her- "Would you have sex with me for 1,000,000 dollars?"
She hesitates and thinks about it a moment and says- "well okay"
"Would you have sex with me for $20.00?"
The woman errupts with outrage- and screams "What do you take me for?"
The man answers- "We already established that, we are just haggling on the price now.
So your "settled" is just a matter of the arguable size of the minority opinion- which just coincidentally coincides with your opinion.