1. In 1848, gold was discovered at Sutter's Mill in Coloma, California. This event is considered the start of the California Gold Rush, which brought thousands of people to the state in search of wealth.

2. In 1929, the first Inaugural Ball was held for a California governor. James Rolph Jr. was sworn in as governor on January 10, but the ball was held on January 20 as a celebration of his inauguration.

3. On January 20, 1942, President Franklin D. Roosevelt signed Executive Order 9066, which authorized the forced relocation and internment of thousands of Japanese Americans living on the West Coast. Many of these individuals lost their homes, businesses, and possessions as a result of this order.

4. In 1961, John F. Kennedy was inaugurated as the 35th President of the United States. Although he was not from California, his presidency had a significant impact on the state and the entire country.

5. On January 20, 1981, Ronald Reagan was inaugurated as the 40th President of the United States. Reagan was born and raised in Illinois, but he later became the Governor of California and was a major political figure in the state for many years. His presidency also had a significant impact on California and the rest of the country.