1. The 1942 Los Angeles air raid incident - On February 26, 1942, a supposed air raid took place in Los Angeles. It was later determined that the event was a false alarm caused by a combination of war nerves and weather balloons. However, the incident led to the government's relocation of Japanese Americans to internment camps during World War II.

2. The 1851 Arrival of the first Chinese immigrants - On February 26, 1851, the first Chinese immigrants arrived in San Francisco. These immigrants were primarily men who came to California to work in the gold mines or on the railroads. They faced significant discrimination and racism from the white population, but their contributions to California's economy and culture cannot be underestimated.

3. The 2015 Apple vs. FBI case - On February 26, 2015, the Department of Justice ordered Apple to assist the FBI in unlocking the iPhone of one of the San Bernardino shooters. Apple refused to comply, citing concerns about the privacy and security of their customers. The case sparked a national debate about encryption and access to private information.

4. The 1815 Battle of San Diego - On February 26, 1815, a group of Spanish soldiers and Kumeyaay warriors engaged in a battle against a group of American sailors near present-day San Diego. The battle ultimately led to the expulsion of the Spanish from the area and marked the beginning of American influence in California.

5. The 1932 Opening of the Palace of Fine Arts - On February 26, 1932, the Palace of Fine Arts opened in San Francisco. The building was constructed for the Panama-Pacific International Exposition and was designed to showcase art and culture from around the world. It is now a popular tourist attraction and a symbol of the city's rich cultural history.