La Matanza, or The Massacre, refers to a period of sustained violence against ethnic Mexicans in Texas amid the Mexican Revolution (1910–1920). Mexicanos and Tejanos were systematically targeted and denied due process by the U.S. Army, Texas Rangers, and other vigilante groups in response to the so-called Bandit Wars along the U.S.-Mexico Border.
Tensions reached their peak following the Plan de San Diego (1915), giving rise to a period of lynchings and massacres known as the Hora de Sangre. It is impossible to know how the number of victims, as people were disappeared, murders went undocumented, neighbors informed on one another, and families fled South to Mexico. However, the killing of at least 300 Mexican-Americans are documented during La Mantanza.