All joking aside, African slavery in America was a terrible evil that has cast a long shadow, one that continues to have profound consequences for the daily lives of ordinary Americans, especially in urban areas and the South. Reparations are absolutely in order.
The only question is where will the money come from? A national registry and an additional sales tax is likely the only practical option. It may also be necessary to deduct reparations from government payments such as food stamps, welfare, housing assistance, etc.
The policy suggested so far is compensatory but fails to cure the ongoing ill. To that end, a poll tax should also be levied, and the rate set sufficiently high to incentivize the changes to birth rates necessary to ensure that the underlying demographic injustice is corrected year over year.
There's no way to go back in time and make whole those who suffered for so many generations. But a thoughtful and well managed policy of income redistribution and demographic management can remove this historical stain from American society.