Find That Book

I haven’t read this book myself but my coworker described it to me and it sounds fascinating. However, he can’t remember the title or author. All he can tell me is that it is about an alternate reality in which the Pilgrims assimilated to Native American culture when they landed in North America, instead of the other way around. The book is set in the modern day and shows what the country would be like now had this happened. I know it’s pretty vague but that’s all he can give me and I’d really like to find it and read it! Thanks!