IQ score differences are huge, and I'm not sure that anyone knows why. We might not have the full picture there for another 50+ years. At this point it would very difficult to even research it given that leftists will try to destroy your career if you do (e.g. the SPLC will smear you as a "white supremacist" if you research or discover or report group differences that are unfavorable to a non-white group, as they have smeared Charles Murray). The black-white IQ differences are greater than one standard deviation, which was very confusing to discover in graduate school – I had no idea. Since IQ predicts income, there is little chance of income parity anytime soon, unless we can find a sort of loophole around that relationship. But we won't be finding any loopholes or workarounds if we're not allowed to research it, so...
The out-of-wedlock birth rate and the IQ disparity are beefy predictors because they're so large in magnitude. Those two variables virtually guarantee a large income difference. There's really no way for a group to make as much money as another group if they're having 72% of their kids out-of-wedlock when the other group is at 20-25%, and also spotting the other group maybe 14+ points on mean IQ. Given those starting conditions, I wouldn't even worry about racism or talk about racism. I would focus on the things that I know are real and the I know are having a huge impact. There isn't any evidence of an equivalent effect of racism. That would be interesting to think about. For racism to be as punchy as out-of-wedlock births or IQ, we would need to see a situation like where basically black college graduates couldn't get jobs due to simple racial discrimination, at a really punchy rate. We don't see that. Systemic racism doesn't exist in the US by any definition I would think of based simply on the term. It seems to reduce to subjective construals through a leftist abstraction layer and symbolic/ideological framework. In other words, you need to be a leftist to see it, and if you don't see this invisible thing, you're a bad person. It's an arbitrary ideology at that point, and the timing is nothing short of predominant.