You make it sound kind of like a random happenstance that the 'natural process' didn't happen organically for African Americans. I'd like to point out that it was actively thwarted by:
* The FHA and redlining
* the backlash to Reconstruction (Jim Crow segregation)
* no compensation for harms of slavery, discrimination, etc (despite other groups getting financial compensation; eg https://en.wikipedia.org/wiki/Civil_Liberties_Act_of_1988)
* lack of protection of suffrage until the VRA in 1965 (despite the 15th amendment)
* The FHA and redlining * the backlash to Reconstruction (Jim Crow segregation) * no compensation for harms of slavery, discrimination, etc (despite other groups getting financial compensation; eg https://en.wikipedia.org/wiki/Civil_Liberties_Act_of_1988) * lack of protection of suffrage until the VRA in 1965 (despite the 15th amendment)
just to name a few.