I’m just really wary of the idea that indigenous people are “extinct” - the idea that their cultures are unknowable. The sentence “Native Americans had nine genders” is functionally meaningless.
Maybe it’s because I grew up going to powwows, but there still are separate and distinct cultures. A lot does get mixed in - fancy dance is a pan-Indian thing, for example, but there are still things specific to tribes, like the Seminole and their stomp dancing.
Native people are very much alive - Star Wars has been dubbed into Navajo, the state of Oklahoma just started graduating Cherokee teachers, the Choctaw nation has put out an app (I’d be legally Choctaw if my mom hadn’t lied about my dad lol). Heck, I am craving an alligator po’ boy from the Chickasaw cultural center right now!