I think the tribes on the Pacific were generally at peace with one another. It was the Plains and Rocky Mountain tribes as well as the eastern tribes that were more war-like and even there it varied widely.
True. Tribes in California were peaceful peoples. Settlers coming west brought their prejudices with them, thinking all Indians were like warlike tribes east of California. As others mentioned, I received education about Indians and California history while attending school in San Francisco. The high school I attended is located in a neighborhood comprised of Indian tribe names for streets ("Cayuga", "Onondaga", etc.). So native american history was not white-washed here, and education even covered the mass deaths of Indians by the diseases the Spaniards brought.