Why is it so hard for African-American girls to have a relationship with Non-African American Males?

I don't really see African American girls as having trouble with non-African American males. I think most African American girls don't date outside of their race as much. My mother is black with a little Native American in her and she married my dad who is Japanese and White. I have some friends who are dating some cute white guys too. I guess it depends on your area but I just think that most black girls stick to their race more than others do but things are changing. I've been seeing more and more relationships like this.