The Great Appalachian Valley, a major landform of the Appalachian mountains, played an important role in the early history of the United States. Routes through the valley, first made by Native Americans, made the mountains passable, later allowing European immigrants to expand colonization of the region. This fascinating book describes the geological makeup and history of the mountain ranges that form the Appalachians, and the people in the United States and Canada who live in their shadows. Special sections also decribe the plants and animals that thrive in these mountain habitats, as well as the unique problems facing this region.