"I wonder if part of the reason for grandfathering Native American rituals was to avoid 1st amendment religious challenge?"
Agree fully with everything you stated. As for the above, we've always been particularly partial to Native American interests legally, partially as "guilt" for past indiscretions. They are a "sympathetic" people, at present.
Yep, so sad what mericans were forced to do at a barrel of a gun. Hope you doing well bud!!