1. In 1884, San Francisco's first electric streetcar began service on the Clay Street Hill Railroad. It was the first cable car railway in the world and revolutionized transportation in the city.

2. In 1938, the Los Angeles Times building at First and Spring streets was bombed, killing 21 people and injuring over 100. It was one of the deadliest acts of domestic terrorism in U.S. history at the time and the culprits were never caught.

3. In 1941, U.S. President Franklin D. Roosevelt visited San Diego to inspect naval installations and shipyards. This was just months before the U.S. entered World War II and the visit emphasized the importance of the city's military industry.

4. In 1959, the San Francisco Giants moved into their new home at Candlestick Park. The stadium would be the team's home for over 40 years before they moved to AT&T Park (now Oracle Park) in 2000.

5. In 2018, a pedestrian bridge at Florida International University in Miami collapsed, killing six people and injuring many others. The bridge was built using an innovative prefabricated design called "accelerated bridge construction," but was found to have numerous flaws in the design and construction process.