In this episode of Border Wars, we travel to the Rio Grande Valley in the southernmost tip of Texas. Along a sixty-mile stretch from McAllen to Brownsville, drug smugglers and illegal immigrants risk their lives to cross the floodwaters of the Rio Grande and make illegal entry to the United States.In this episode of Border Wars, we travel to the Rio Grande Valley in the southernmost tip of Texas. Along a sixty-mile stretch from McAllen to Brownsville, drug smugglers and illegal immigrants risk their lives to cross the floodwaters of the Rio Grande and make illegal entry to the United States.