Native people were in California for over 10,000 years. Approximately 5,000 years ago, the people that would became known as the Ohlone moved in to the bay area and San José. The Ohlone then did something few groups of people have ever done in the history of earth. They enjoyed approximately 4,500 years of peace. A peace that evidence indicates amounted to approximately 4,500 years without an epidemic, significant conflict or war, natural catastrophe, or famine. Wow, that is a long run of peace, good management, and fortune.
Source: The Ohlone Way, book by Malcom Margolin, 1978, pages 58-60.