All those dudes were household names in the US. The US also has a much larger pool of fit black women to pick from. All these dudes were around black people and black people knew them. They also are not Canadian. I got US family members that look at Canada as

.
Just saying, it's perfectly normal to see a guy who is surrounded by a certain group of people to.....date within that group.
But as far as pro athletes. Man, tonnes have non-black wives.
OJ
Jerry Rice
Kobe
Jordan
Tiger
Rodman
Ashley Cole
Lamar Odom
Hank Baskett
Golden Tate
Russell Wilson (previously)
RG3
And I can go through and list the black hockey players wives.....they're all white.