1. On September 14, 1829, the Mexican government granted the former Spanish governor of California, José María de Echeandía, a large plot of land in what is now San Diego. This land became known as Rancho Santa Margarita y Las Flores, and it played an important role in early California history.

2. On September 14, 1847, the United States Army under the command of General Winfield Scott captured Mexico City, ending the Mexican-American War. The victory led to the signing of the Treaty of Guadalupe Hidalgo, which ceded California and much of the Southwest to the United States.

3. On September 14, 1907, a magnitude 7.9 earthquake struck the town of Lone Pine in Inyo County, causing widespread damage and killing at least 52 people. The quake was one of the largest in California history and is still remembered today as the Lone Pine earthquake.

4. On September 14, 1960, OPEC (the Organization of Petroleum Exporting Countries) was founded in Baghdad, Iraq. California, with its vast oil reserves, would become an important player in the global oil market and a crucial member of OPEC.

5. On September 14, 2015, Governor Jerry Brown signed SB-277 into law, which eliminated personal belief exemptions for vaccinations in California. The law was in response to a measles outbreak that had spread through Disneyland earlier that year, and it made California one of the strictest states in the country when it comes to vaccination requirements.