I really really enjoyed "The Comanche Empire" https://yalebooks.yale.edu/book/9780300151176/comanche-empir...

It took a long time to get through (very dense, academic) but was a sprawling look at a powerful indigenous culture that I knew nothing about.

Plus, it was enlightening and a bit foreboding to learn how an empire could be at the very height of its power and then, through circumstance, climate, demographics, and imperial expansion be exhausted and destroyed in essentially a decade.