"A book that radically changes our understanding of North America before and after the arrival of Europeans Encounters at the Heart of the World concerns the Mandan Indians, iconic Plains people whose teeming, busy towns on the upper Missouri River were for centuries at the center of the North American universe. We know of them mostly because Lewis and Clark spent the winter of 1804-1805 with them, but why don't we know more? Who were they really? In this extraordinary book, Elizabeth A. Fenn retrieves their history by piecing together important new discoveries in archaeology, anthropology, geology, climatology, epidemiology, and nutritional science. Her boldly original interpretation of these diverse research findings offers us a new perspective on early American history, a new interpretation of the American past. By 1500, more than twelve thousand Mandans were established on the northern Plains, and their commercial prowess, agricultural skills, and reputation for hospitality became