Ebook: The great divide: nature and human nature in the Old World and the New

"Compares and contrasts the development of humankind in the old world and the new between 15,000 B.C. and 1500 A.D., and cites climate, domesticable animals, and hallucinogenic plants as the reasons for the discrepancy"--Provided by publisher.;Introduction: 15000 BC-AD 1500 : a unique period in human history -- How the first Amerians differed from Old World peoples -- How nature differs in the Old World and the New -- Why human nature evolved differently in the Old World and the New -- Conclusion: The shaman and shepherd : the gread divide -- Appendix 1: The (never-ending) dispute of the New World -- Appendix 2 (available online): From 100,000 kin groups to 190 sovereign states : some patterns in cultural evolution.