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- 1850 – Los Angeles, California is incorporated as a city.
- 1873 – The Kennel Club is founded, the oldest and first official registry of purebred dogs in the world.
- 1969 – Dr. Denton Cooley implants the first temporary artificial heart.
- 1973 – The World Trade Center in New York is officially dedicated.
- 1975 – Microsoft is founded as a partnership between Bill Gates and Paul Allen in Albuquerque, New Mexico
- 1994 – Marc Andreessen and Jim Clark found Netscape Communications Corporation under the name “Mosaic Communications Corporation”.
