That is the stupidest idea I have ever heard!
It would be an impossible nightmare to trace, and then prove, and then separate out, by states, everyone’s genealogy.
Of course, everyone who has ancestors that immigrated to the United States, AFTER slavery was abolished, would pay nothing, and get nothing. Likewise, those who had ancestors that were slaves before 1789 would have to go to Great Britain if they want financial damages.
However, it would not be as simple as seeing who came here after the 1860’s, but you would certainly have to do it by state. If Michigan never had slavery, then people who have ancestors from Michigan get nothing, and they pay nothing.
If half of your ancestors were slaves, and half were slave owners, then you pay yourself. For example, the simplist example is that if Tom Jefferson and Sally Hemmings had a child, then that half-white half-black child would simply pay herself, and we would then call it even - the child would net not paying anything, and would not end up with anything either.
I wouldthink, to be fair, that if your ancestor was a black slave owner, then you would have to pay the special reparations tax to a white decendant of a Union soldier who fought to end slavery.
Certainly people who had no ancestors who were either slaves or slave owners, dont pay or get anything, regardless of when they came here.
The farther you get from 1865, or 1789, the more difficult it would be to determine who would pay who much and who would get how much. IF you are 1/32 a decendant from an ancestor who was a slave, then although you get 1/32 of the reparations, you also have to pay 31/32 of the special tax bill which means you might be paying a LOT more than you would be getting .
If you really want reparations, then come up with a workable computer program that will correctly process all possible conditions.
Until you can correctly figure out how to do it, then the “reparations” that you talk of is just a “red herring”.