1. In 1952, the first ever hydrogen bomb test was conducted at Eniwetok Atoll, a US territory in the Pacific Ocean. This test, code-named Ivy Mike, marked a significant milestone in the development of nuclear weapons technology.

2. In 1989, a major earthquake struck the San Francisco Bay Area, killing 68 people and causing widespread damage to buildings and infrastructure. The magnitude 6.9 quake, known as the Loma Prieta earthquake, was one of the most destructive in California's history.

3. In 1944, the USS Tang submarine was sunk by friendly fire during a mission in the Pacific. The incident resulted in the loss of 78 crew members and made the Tang one of the most dangerous foes of the Japanese navy during World War II.

4. In 2003, former Governor Arnold Schwarzenegger was elected as California's 38th governor in a recall election. Schwarzenegger, a former actor known for his roles in blockbuster movies such as Terminator and Predator, served two terms as governor.

5. In 1879, the California State Capitol building in Sacramento was completed. The historic building, which houses the offices of the governor and the state legislature, is considered an important symbol of California's political and cultural heritage. Today, the State Capitol is a popular destination for visitors and tourists from around the world.