San Diego has been called „the birthplace of California“.Historically home to the Kumeyaay people, it was the first site visited by Europeans on what is now the West Coast of the United States. Upon landing in San Diego Bay in 1542, Juan Rodríguez Cabrillo claimed the area for Spain, forming the basis for the settlement of Alta California 200 years later. The Presidio and Mission San Diego de Alcalá, founded in 1769, formed the first European settlement in what is now California. In 1821, San Diego became part of the newly independent Mexico, which reformed as the First Mexican Republic two years later. In 1850, California became part of the United States following the Mexican–American War and the admission of California to the union.
According to SDSU professor emeritus Monte Marshall, San Diego Bay is „the surface expression of a north-south-trending, nested graben“. The Rose Canyon and Point Loma fault zones are part of the San Andreas Fault system. About 15 miles (24 km) east of the bay are the Laguna Mountains in the Peninsular Ranges, which are part of the backbone of the American continents.