1. In 1847, the Battle of Rio San Gabriel was fought between the United States and Mexico during the Mexican-American War. The United States won the battle, which helped them gain control of California.
2. The San Francisco Cable Car Company began operating on April 27, 1878, becoming the first successful cable-operated streetcar in the world.
3. On April 27, 1949, the Federal Republic of Germany was established, and the former German Consulate in San Francisco was officially recognized as the German Consulate General.
4. In 1960, the San Francisco Giants played their first game at Candlestick Park, which would be their home stadium for the next 40 years.
5. The Los Angeles riots began on April 27, 1992, following the acquittal of police officers in the beating of Rodney King. The riots resulted in 63 deaths and over 2,000 injuries, and caused significant damage to the city.