In attractive large format, a clearly organized, readable introduction to the earliest humans to populate the Americas, arranged chronologically from their first appearance (at least 15,000 years ago) to the time of Columbus. Both text and illustrations are full of intriguing detail: Sattler clearly shows how current archeological discoveries lead scientists to draw conclusions about the lives and astounding accomplishments of the various peoples; Zallinger's meticulous brown-toned drawings feature maps, artifacts, and children and adults in daily activities. Both text and illustrations have been checked for accuracy by experts, though one might quibble over the incomplete description of the Mayan mathematical system. Pronunciation guides and definitions are frequently provided in the text (there's no glossary). A time chart provides fascinating comparisons with peoples in Europe, Asia, and Africa. Lengthy chapter-by-chapter bibliography, including many recent items from adult periodicals; index. (Nonfiction. 10+)