I think you should check your preachy tone, because the black and white race are Not spouses.
No, they aren’t. But people living in the same country have to get along, and things need to be fair, and just for everyone and you can’t get that unless you can talk, and you can’t really do that unless you get along well enough to talk about difficult things, without getting in a fight. So married? Maybe not. But stuck in the same boat? Surely.
*Edit: This has not bearing on the rest of your comment, it just struck me as an interesting point.