Segregation works. White flight is an effective way to reduce crimes of African origin against whites, Asians, and others. If you have ever tried to raise a family in an African neighborhood you find out very quickly why non-blacks leave and it has nothing to do with color, but everything to do with their criminal behavior.
African origin, you mean mixed origin, and no offense sir the ones I know came here worked hard for a traditional degree and and seem to be making the dark skinned ones here look like pieces of $hit and as for me, my family has been here for many generations as Americans and served in many wars going back to WWII, including myself though I am in Afghanistan currently supporting a signal BN as a IT contractor, just saying not to harp on you.