In this comprehensive history, David J. Weber draws on Spanish, Mexican, and American sources to describe the development of the Taos trade and the early penetration of the area by French and American trappers. Within this borderlands region, colorful characters such as Ewing Young, Kit Carson, Peg-leg Smith, and the Robidoux brothers pioneered new trails to the Colorado Basin, the Gila River, and the Pacific and contributed to the wealth that flowed east along the Santa Fe Trail.