1491 by Charles C. Mann
8 out of 10

I am a few centuries late to reading this book.  It holds up.  Mann discusses the current anthropological, paleontological, geological, and genetic research that highly suggests that people have been living in the Americas longer than previously hypothesized.  Additionally, people had been living in larger numbers and had had a larger impact on the landscape.  There are still plenty of unanswered questions about who and how.  The story of the Western Hemisphere over the past 30,000 years continues to be unearthed.