It makes sense that blacks think the US is 400 years old. It's consistent with your comment about the self inflicted genetic mental damage blacks contend with every day. bonobo did after all say he visited all 57 states during his campaign.
Unfortunately, it does take 400 years to get a decent days work out of blacks and the US has only been a country for ~235. And then they spent the last 50 years on welfare. So bottom line, if we do the math,... not not carry the 2,...... it looks like blacks owe us about 215 more years of slavery.