Nestled amid cotton, pine, and swamps, the Deep South outpost of Valdosta, Georgia, has long drawn pilgrims from across the country to the home of the Wildcats, the winningest high school football team in America. Christened by national media as "Title Town, USA," Valdosta has thrived on the continuity of dominance: sons still play in front of fathers and grandfathers, creased men in pickups still offer steak dinners as a reward for gridiron glory,...