"The California Genocide refers to actions in the mid to late 19th century by the United States federal, state, and local governments that resulted in the decimation of the indigenous population of California following the U.S. occupation of California in 1846.
Actions included encouragement of volunteers and militias to kill unarmed men, women and children.
Location California
Date 1846–1873
Target Indigenous Californians
Attack type: Genocide, ethnic cleansing
Deaths 4,500-16,000 Indigenous Californians outright killed, thousands more died due to disease and other causes
Perpetrators: United States Army, California State Militia, white settlers"
https://en.wikipedia.org/wiki/California_Genocide