The Waggoner Ranch in north Texas is slightly smaller than Rhode Island and is the largest ranch in the U.S. within a single fence. Everything about it is Texas-scale: the colorful history, the sprawl, the oil that lies beneath it, and the feud among the heirs that is forcing a court-ordered sale. This old-fashioned working ranch comes with 6,800 cattle, 500 quarter horses, more than 1,000 producing oil wells, nearly 30,000 acres of farmland and more than 150 years of history.