Zimbler,
re: "Last time I checked . . . The percentage of blacks was around 20% . . ."
It's never been nearly that high.
Per Wikipedia, whites make up 63.7 percent of the 2010 U.S. population, hispanics/latinos make up 16.3 percent, and all other races including blacks make up 19.9 percent. That's probably what you're thinking of when you say 20 percent, but you're forgetting about the 5 percent each of Asian and "other race" going into that 19.9 percent figure.
The actual black percentage in our country is 12.6. I'll grant, no one would ever think it was nearly that low based on how much attention blacks receive from our media, from racists like clo and OCU, and from our prison system.
http://en.wikipedia.org/wiki/Demographics_of_the_United_States
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