Eminent anthropologist Jennifer Raff explores human migration going back 20,000 years. Raff explores the theory that people crossed over a land bridge connecting Siberia to Western Alaska and then moved south into the Americas. Genetics and identity are intrinsic to this study of human origin, including the use of human genomes to create a map to the founding of the Americas. Ultimately, this book considers the question of who is indigenous and what indigenous really means.