I know a number of interracial (black/white) couples, as well as Caucasian/Asian couples and Anglo/Hispanic couples.
The situation just takes determination. In a way, every married couple is a “clash of cultures.” Don’t get me started on my in-laws.
"I have known many happy marriages, but never a compatible one. The whole aim of marriage is to fight through and survive the instant when incompatibility becomes unquestionable. For a man and a woman, as such, are incompatible." --- G. K. CHESTERTON