Maybe that's where they are needed. If the people are poor they have easy access. Maybe they can't afford certain types of birth control such as the pill. Maybe some neighborhoods don't want a clinic.
Consider the following:
Within the past two decades, fertility rates have declined substantially among non-Hispanic blacks (from 91 births per 1,000 women aged 15 to 44 in 1980 to 67 per 1,000 in 2005)* and among American Indian and Alaska Native women (from 83 births per 1,000 to 60 births per 1,000 women between 1980 and 2005)*. Fertility rates also declined slightly overall among non-Hispanic whites (from 62 births per 1,000 women in 1980 to 58 births per 1,000 women in 2005)*.
http://www.childtrendsdatabank.org/pdf/79_PDF.pdf
Blacks: births declined from 91 per 1000 to 67 per 1000
Whites: births declined from 62 per 1000 to 58 per 1000
Either more white women choose abortion or fewer white women become pregnant. In either case blacks are bearing more children so whomever believes abortion clinics are some sort of master plan to eradicate the black folks....well, I guess they aren't too good at math.