This is a good start in the Hometown of my own family where my dad was born. A healing ceremony for a wrong done back in 1676 when we were not yet a nation and were fighting with the first nation people who wanted to keep their homes.
In nearby Deerfield Massachusetts, settlers got inbetween a war between first nation tribes and they wound up getting massacred. In another colonial period the great falls ran with salmon. Not there is a dam with a fish ladder, but few salmon actually get through it to the upper river. Technology does not always fix a problem.
In the case of the tribe and the town, they used an ancient ceremony to heal the community over this past bad deed. I hope it worked when Turner, the fellow whose name is now on the Falls, surrounded a native camp, probably there to fish, and many were killed who were innocents in the events going on around them.
The events of today around the world like Syria, and the Sudan, tells me we are still trying as a human race to learn from our past mistakes.