1. California Became a State: On October 1, 1850, California officially became the 31st state in the United States. The statehood was a result of the California Gold Rush that brought thousands of people to the state in search of gold.

2. First Major Earthquake: California is known for its earthquakes, and the first major recorded earthquake happened on October 1, 1898, in Mare Island. This earthquake had a magnitude of 6.3 and caused significant damage to several buildings and structures.

3. Disneyland Opened: Disneyland, the world-famous amusement park, opened its doors to the public on October 1, 1955. Located in Anaheim, California, the park has become a popular tourist attraction and a source of entertainment for visitors from all over the world.

4. Oakland Bay Bridge Opened: The Oakland Bay Bridge, one of the most iconic landmarks in California, opened on October 1, 1936. The bridge spans across the San Francisco Bay, connecting San Francisco and Oakland, and is known for its unique design and breathtaking views.

5. First California Governor Inaugurated: On October 1, 1849, Peter Hardeman Burnett was inaugurated as the first Governor of California. Burnett served as the governor for only one year, and during his tenure, he played a crucial role in developing the state's infrastructure and economy.