In a comment to the earlier post, Kimberly points to some Census and CDC statistics that show that poverty and early child-birth go hand-in-hand. We can see that more blacks and Hispanics live in poverty than whites and Asians, and that they also tend to have first children at an earlier age. "The tables show that the largest percentage of first children are born to 25-29 year olds for Whites, and 30-34 year olds for Asians. But for blacks, the largest category is at 15-19 years, and for Hispanics, it's at 20-24 years."
As Kimberly points out, correlation doesn't prove causation. What's interesting though is that these statistics for first-births obviously don't include abortions, and black women have approximately three times as many abotions per capita as the average woman across all races. I don't know the stats for Hispanic women or Asian women.
I don't know how much blacks are suffering from direct racism these days, but I do think their subculture is still suffering the effects of past discrimination. As subcultural lines break down over time and the various American subcultures continue to mix, these effects should be mitigated. As for Hispanics, the problem isn't discrimination so much as the fact that many Hispanic families haven't been in the country for very long yet and haven't had time to assimilate.