I gave up on the idea of reparations as I've worked through this discussion, but within my previous theory about reparations, we don't owe people anything for what was done 200 years ago. All those people are dead and gone. 5 to 8 generations (depending how you count) have passed since the end of slavery. The masters and slaves both are long dead.
The worst period of Jim Crow is now a century past. Those people are also dead.
The people to whom a debt could be considered payable are the children of the last generation and their parents. So 3 generations, back to the beginning of the Federal Housing Program post WWII. During the 1940s, 50s, 60, and into the 1970s, blacks were systematically excluded from a critical wealth-building program: the construction of huge suburban tracts around all of the major cities. They were excluded explicitly: Blacks were not to be approved for mortgages in suburban building projects. (You can read all about the policy in the recent book, The Color of Money.)
Whites who were given mortgages in the suburban projects were able to benefit from the appreciation of their high quality homes. Home value appreciation became the core cash asset of the white middle class.
For blacks? It was new, large-scale, high rise construction that was designated as rental property. The quality of the homes was good, but urban administrations were usually not willing to spend the money on maintaining the buildings so that they would remain good places to live. In any case, renters do not accumulate equity.
In cities where the large high-rise and dense public housing buildings were maintained, they remain in good shape. After all, cast concrete doesn't deteriorate very fast. Of course, it wasn't the concrete that failed in cities that neglected their public housing. It was the elevator systems, heating, ventilation, cleaning, routine maintenance, and security that failed, eventually turning the neglected buildings into cast concrete shit holes.
In addition to dealing the black population out of value-appreciating suburban housing, blacks tended to be concentrated (an active process) in specific "redlined" areas -- slums, in other words. Generally low levels of income caused by poor education, insufficient access to jobs or the transportation needed to get to outlying jobs, and harsh policing (which other groups of people were not subject to) resulted in the present underclass. You can add on to all that "the end of welfare as we know it" in the 1990s under William Jefferson Clinton, president of the US from Arkansas.
Just as suburban development benefitted whites from coast to coast, the pattern of denying blacks opportunity was also carried out coast to coast.
The blacks who would receive reparations, if reparations were to be handed out (don't worry, they won't be, ever) are blacks who are alive now and have suffered under current and recent policy.
Look, you didn't do it to blacks, and I didn't do it to blacks. My parents didn't participate in the suburban program because they lived in a small town, where the FHA was not building nice homes. I didn't benefit from black poverty, and neither did you. The idea of reparations doesn't depend on you or me benefitting or causing the problem. We are merely part of the country led by some people who went out of their way to fuck over black people once more time.