The premise of the show is a Golden Ending Alternate History branching off from the original movie.
Rather than, as those who dislike the show have put it, erasing historical atrocities and racial oppression, division, and discrimination, the show instead is a Golden Ending Alternate History set 20 Minutes into the Future from the original movie.
Instead of real life history eventually overriding Spirit Senior and Little Creek's victory, the Colonel goes back to the US Congress and convinces them to make the inhabiting of the Wild West a peaceful one, in a way that truly benefits both the native indigenous people and the new settlers travelling to start a new life there, along with pushing the idea that wild animals and pack animals should be treated much better and more nicely.
The icing on the cake is the push for complete racial equality, after the tale of Little Creek is told.
This is why Pru and Lucky, despite being children of colour, can walk around the land freely and happily. And this is why there is zero attention called to Mixtli's culture, with the conflict surrounding him being merely because of him not being of legal age to travel by himself, rather than of any racial discrimination.
