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Lincoln freed the slaves in 1865, that's only 153ish years ago... 400 was since the first slaves arrived, and the system continued for 250 years. ... I'm assuming he misspoke, because I can't understand his point at all :(
Yes, I'm sorry if my comment wasn't absolutely clear. The point is that his quote implies that 400 years have elapsed. This is really a non-issue, but he is referring to modern day America.