I'm curious about whether or not the wealth generated from the free labor has been overtaken by the various historical costs, as well as the modern costs of social services, incarceration and policing etc
Dude. This is enormously offensive because you act like the only benefit that slaves and their descendants have provided is free labor, and that since emancipation there have only been costs. You do realize that descendants of slaves in America currently and historically contribute positively to our economy, right? Don't they still do Black History Month in schools?