Don't mean to guano this thread, but I'm ITA. Check out the "party" photos in Improper Bostonian; 98% "blonde". I think it might be the strong Irish/Wasp hold on Boston. Doesn't matter what Boston suburb/neighborhood, except... maybe... for non-white ones. At work, all the field-sales women from around the country were in for a meeting, and to a woman, they were blond with highlights, low-lights, 2-toned. Whatver you could do with peroxide was represented in that room
Also, I have seen black men and women with natural red hair. Went to school with 2 of them. I'm African-Jamaican-American.