It seems to have affected blacks to a much greater degree than whites, at least since 1975. I don't have earlier figures.
>> It seems to have affected blacks to a much greater degree than whites
The leftist policies have affected blacks for much longer than whites, in particular the breakdown of the nuclear family.
To support my position, you’ll notice that even though there are proportionately more blacks in the South than any other region, that’s the region that saw the biggest decline in violent crime.