Here is Wikipedia's entry on the subject:
http://en.wikipedia.org/wiki/History...y_20th_century
Quote:
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The Mexican Revolution that began in 1910 against President Porfirio Díaz changed the relatively peaceful state of affairs along the border. Soon after, violence on both sides of the frontier escalated as bands of Mexicans took over border towns and began crossing the Rio Grande on a near-daily basis. Taking over trade routes in Mexico by establishing themselves as road agents, Mexican banditos turned towards attacking the American communities for kidnapping, extortion, and supplies. As Mexican law enforcement disintegrated with the collapse of the Diaz regime, these gangs grouped themselves under the various caudillos on both sides of the border and took sides in the civil war, most simply to take advantage of the turmoil to loot.[18] Then, as the lack of American military forces for defending the border became clearer, the scope of the activities soon turned to outright genocide with the intention of driving Americans out of the Southwest entirely; this became known as the Plan de San Diego in 1915. In several well-rehearsed attacks, Mexicans rose up and in conjunction with raiding Villista* guerrillas, within weeks had killed over 500 Texan women, children, and men.
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This is the main entry:
http://en.wikipedia.org/wiki/History...anger_Division
More about "plans" issuing from Mexico during this period. In Wikipedia, Plan de San Diego is not listed here.
http://en.wikipedia.org/wiki/Plans_in_Mexican_history
Wikipedia only takes time to mention the Plan de San Diego in the context of the History of the Texas Rangers and takes great pains to suggest the Texas Rangers were equally criminal. More fake symmetry grafted on to history.
*the Villistas were followers of Pancho Villa