1. California officially became a state on June 30, 1850, making it the 31st state in the United States. This date is now celebrated as Admission Day.

2. On June 30, 1945, the Battle of Balikpapan began. This battle took place in Borneo during World War II and was fought by Allied forces, including soldiers from California. It was one of the last major battles of the Pacific War and helped secure victory for the Allies.

3. California's deadliest earthquake in recent history occurred on June 30, 1992, in the Mojave Desert. The earthquake, which had a magnitude of 7.3, caused widespread damage and multiple fatalities.

4. On June 30, 1953, the first modern toll road in California opened. The road, known as the Foothill Toll Road, was built to connect Orange and Riverside counties and helped spur development in the region.

5. June 30, 2018, marked the end of California's longest-running drought in modern history. The drought, which lasted over 7 years, had a significant impact on the state's water supply, agriculture, and economy. The end of the drought was celebrated by many Californians, but experts warn that the state must continue to prioritize water conservation and management.