Miamilawyer,
1. It cannot be known what percentage of American blacks are descendants of slave owners . As for Bnei Noach yichus is through the father that would make them Brtish.
2. According to many economists, the welfare state is responsible for entrenched black poverty as it encourages the breakup of families. Regarding the current situation, many observers blame identity politics. Libertarians have jumped on this bandwagon and blamed a general collectivist mentality. IMHO, this seems logical. If you look at the person across from you as another individual you relate to him differently than if you look at him as part of an enemy group. Thus, the generals did not allow a repeat of the first WW1 Xmas truce when Allied and German soldiers fraternized with each other.