1. In 1850, San Francisco was incorporated as a city, making it one of the oldest cities in California.
2. In 1906, the Great San Francisco Earthquake occurred on April 18, but the fires that destroyed much of the city were finally brought under control on April 25.
3. In 1984, the Los Angeles Olympics Committee announced that it had chosen the city to host the 1984 Summer Olympics, making it the first time since 1932 that the games had been held in the United States.
4. In 1990, the Hubble Space Telescope was launched from the Kennedy Space Center in Florida, but its journey to orbit took several days and it wasn't until April 25 that it was successfully deployed.
5. In 2015, protests erupted in California over the police shooting of Freddie Gray in Baltimore, Maryland. Demonstrators marched in Los Angeles, Oakland, and San Francisco, expressing solidarity with those in Baltimore and calling for an end to police brutality.