It's the percentage of new marriages that's relevant here. Most are obviously straight, but is it still the case that the majority of new marriages in the US are between two white people? I'm not saying it is or it isn't, just curious.
> most couples in America are straight and white.
True, if by "most" you mean a bit more than 50%.
What other definition is there for "most"?
More than 50%
"Most" could be far less than 50% if there were no other cohorts that exceeded the lower percentage.