" Wikipedia: Plan of San Diego
The Plan of San Diego (Spanish: Plan de San Diego) was drafted in San Diego, Texas, in 1915 by a group of unidentified Mexican and Tejano rebels who hoped to secede Arizona, New Mexico, California, and Texas from the United States and create a racial utopia for Native Americans, Mexican Americans, Asian Americans, and African Americans. The plan called for the execution of all white men over the age of sixteen.

The goal of the plan is debated. The plan stated a supposed "attempt to overthrow the government in the Southern United States." However, some theories state that the true goal of the plan was to create the conditions to force the US to support one of the factions of the Mexican Revolution, as eventually occurred.

The plan called for the killing of all adult white American men in the Southwestern states and the "return of land to Mexicans." It was, however, exposed before it could be fully executed. Although there was no uprising, there were raids into Texas that began in July 1915. The raids were countered by Texas Rangers, the U.S. Army and local self-defense groups. In total, 30 raids into Texas destroyed large amounts of property and killed 21 Americans. It is not known who was responsible for drafting the Plan of San Diego, but there are theories that Mexican revolutionary leaders helped to sponsor it. "

― Wikipedia Contributors