1. On January 6, 1925, the first woman governor in California and the United States, Nellie Tayloe Ross, was inaugurated as governor of Wyoming. Although this event did not take place in California, it marked a significant milestone for women in politics.

2. In 1838, the first Protestant church in California, the First Presbyterian Church, was established on January 6 in San Francisco. This church played an important role in the religious and social life of the city, particularly during the Gold Rush era.

3. On January 6, 1919, California launched the first scheduled airmail service in the United States, with a flight from San Francisco to New York. This service revolutionized mail delivery and helped to establish the importance of air travel in California and across the country.

4. In 1994, the Northridge earthquake struck California on January 6, causing significant damage and loss of life. The earthquake, which measured 6.7 on the Richter scale, was one of the costliest natural disasters in U.S. history, with an estimated $20 billion in damages.

5. On January 6, 1978, the landmark case of Serrano v. Priest was decided in California Supreme Court. The ruling declared the state's method of funding public schools unconstitutional and led to significant changes in how education was financed and managed in California.