We have an order of magnitude better a view on the facts of history than we did 100 years ago.
Just as DNA evidence gives cause to reopen the cases of living incarcerated, we should pull all of the current land claims in the U.S. which include any claims granted under treaty and if there is any new evidence of criminal wrongdoing, adjudicate those crimes and bring forward any civil litigation that may fall from those decisions.
Heck, exempt any existing structures, with an easement, to appease existing residents. But any empty space, undeveloped land, farmland, etc can be returned.
Offer any residents of the space a share too, as needed. Not corporations but individuals up to a certain acreage if they can show they continuously kept that land in production.
Murder is not an excuse for ignoring a signed legal document, and hasn’t been in this country for hundreds of years.
We only have time. Maybe it takes 1000 years but I believe the First Nations will be made whole, to whatever degree the Constitution indicates in its highest interpretation.