After the outbreak of the Mexican Revolution, as fighters crossed into Texas to raid ranches, Texas hired hundreds more Rangers to defend the state—many with hardly any qualifications. The atmosphere of suspicion and fear between Anglo and Mexican Texans gave rise to an era of state-sanctioned violence by Rangers, vigilantes, and other officials. It reached its peak at a massacre in the West Texas town of Porvenir.You can read more about the stories in this episode in "Revolution in Texas," by Benjamin Johnson, and "Redeeming La Raza," by Gabriela Gonzalez.