A century ago, when Texas, New Mexico, and Arizona outlawed steer roping contests, there was one place a southwestern roper could go to hone his skills: Cowboy Park, the arena established in 1907 in Ciudad Juarez, Mexico, just across the Rio Grande from El Paso, Texas. During the formative years of rodeo that preceded the first Calgary Stampede in 1912, Cowboy Park promoted the sport of steer roping and provided a ready training ground for up-and-coming champions. From its inception until growing political turmoil in Mexico brought the enterprise to a halt, Cowboy Park kept the sport alive...