This article went live a few days ago.
https://www.salon.com/2018/04/20/kee...umni-lives-on/
It was as recently as the generation of both my Indian grandfathers when children were humiliated and cruelly punished for speaking "foreign" languages which were not foreign. Thus, our Native American tongues are rarer-than-rare, critically-endangered species.
There are instructions at this site, if you want to see the full video.
Jennifer