Please note: This is a companion version & not the original book. Sample Book Insights:#1 The Pleistocene Epoch, which began about 2. 6 million years ago and lasted until about 11,700 years ago, marked profound changes in the history of the human race. People began to form into bands of hunters and foragers who lived nomadic lives in temporary camps.#2 The first Native Americans, who were the first settlers in the Americas, were forced to go east or west as the land bridge between Asia and America disappeared under the rising water. They were isolated from each other and from other growing human civilizations.