1542 Navigator João Rodrigues Cabrilho of Portugal arrives at what is now San Diego, California, United States.
1769 Father Junipero Serra founds California's first mission, Mission San Diego de Alcalá. Over the following decades, it evolves into the city of San Diego.
1978 PSA Flight 182, a Boeing 727-214, collides in mid-air with a Cessna 172 and crashes in San Diego, California, resulting in the deaths of 144 people.