Required reading for an American Indian Literature class I read was 500 Nations- I certainly agree the variety is widespanning. I confess my comfort with the vagueness is my own slant which finds comfort in finding that people usually have much more in common than not. In the same way while I like exploring strange new worlds and all, I have enjoyed the idea that Romulans and Klingons and Vulcans and Andorrians and Tellarites and Cardassians (and so many others) all value their families and have personal codes of honor/behavior that echo a larger cultural view and that most can put aside personal issues and even sacrifice themselves for a greater good.
Sure - that's all absolutely true. We all have a
lot in common. But why make him "Native American" (and would a Mayan count as Native American?...maybe so, if you use a broad enough definition of "American") if they didn't want to use that in any meaningful way?
But of course it wasn't just Chakotay that they did this with - not by a long shot. Why make Worf's parents Russian, why make Riker Alaskan? (For that matter, why give Troi that odd accent that no other Betazoid had?) I have often wondered if the Trek PTB have some gigantic Wheel o' Origin somewhere that they spin whenever they are in a quandry over such things.