The first few chapters of this book clearly deserve 5 stars.
The rest of the book is probably equally well-written and equally well-researched, but it didn't do for me what the beginning did.
Frazier starts out by answering the question of how and why a Native nation would accept Christianity. The short answer is that the fur trade had destroyed so much of their traditional ways in the first 100 (or 115) years of white contact that the Indians were looking for new structures to hang onto. That willingness to try something different in the face of generations of grave losses was of great interest to me.
Others will be interested in the rest: war, litigation over land, getting cheated by white traders, these things are important aspects of American history that many will want to read about.