There's no reason to believe otherwise. Just because some cities may be filled with black people doesn't change the fact that America is swarming with CACs and other non-black people. I'm sure that once you move out of the inner city you'll see that blacks virtually disappear.
Over here in Canada, you'd probably think there are a ton of blacks in Canada if all you've been to are multicultural cities like Ottawa, Toronto, and Montreal. However, once you get away from these places you'll realize how few black people there actually are in the country. I believe blacks make up 2.9% of the Canadian population, and the majority of them live in Ontario.