Yes, you're right. He's never understood fundamentally why black Americans lag behind so many other groups in the USA. If racism were the only explanation, why do foreign born black Americans have greater average incomes than American born black Americans? I'd say it's largely because those folks come with intact families and greater focus on work. Their homelands didn't give them much help and they expect to have to go out and get it on their own.
See the link.
http://www.pewsocialtrends.org/2015/04/09/a-rising-share-of-the-u-s-black-population-is-foreign-born/st_2015-04-09_black-immigrants-13/
wow. South American blacks do pretty well. They make more than the average of all US adults. I would have never thought.
10,000 is a large gap. You are right. I wonder if this includes welfare for the American blacks.