OK, it was to you. The slaughter of the Northern California Natives was pretty unprecedented after 1849.. even in Violent North America...
Only a remnant population of First Peoples continued to exist in California at the time of the Treaty of Guadalupe Hidalgo. There were massacres by Americans such as the case of Ishi and the Yahi, but most California First Peoples were already gone through disease or Spanish/Mexican exploitation. I live in one of those mission towns where it occurred.