The San Bernardino Valley () is a valley in Southern California located at the south base of the Transverse Ranges. It is bordered on the north by the eastern San Gabriel Mountains and the San Bernardino Mountains; on the east by the San Jacinto Mountains; on the south by the Temescal Mountains and Santa Ana Mountains; and on the west by the Pomona Valley. Elevation varies from on valley floors near Chino to near San Bernardino and Redlands. The valley floor is home to over 80% of the more than 4 million people of the Inland Empire region. History The San Bernardino Valley was originally inhabited by Californian Native Americans, including the Serrano, Cahuilla, and Tongva tribes. The Mohave Trail, a trade route from the Mohave villages on the Colorado River that crossed the Mojave Desert from spring to spring and then followed the Mojave River upstream, entered the valley from the slopes of Monument Peak in the San Bernardino Mountains. The Spanish missionaries established the Politana rancheria in the valley in 1810, an estancia, or ranch outpost, of Mission San Gabriel Arcángel. It was built to graze cattle, and for Indian Reductions of the Serrano people and Cahuilla people into Mission Indians. After being destroyed in a revolt, the estancia was later reestablished as San Bernardino de Sena Estancia in 1830. It is now a California Historical Landmark and museum in Redlands. From 1829, the Old Spanish Trail from New Mexico to Alta California was established and entered the valley through Crowder Canyon and the lower canyon of Cajon Pass. In 1841, Governor Juan B. Alvarado of Alta California issued a Mexican land grant for Rancho San Bernardino, which included most of the San Bernardino Valley, to José del Carmen Lugo, José Maria Lugo, Vincente Lugo, and their cousin Jose Diego Sepulveda. Included were all of the original estencia buildings: the chapel, a tile kiln, a lime kiln, and a grist mill. By offering land, José Maria Lugo convinced a group of settlers from Abiquiu, New Mexico to settle on his rancho at Politania and defend against Indian raiders and outlaws preying on the herds of the Ranchos in Southern California. These emigrants first colonized Politana on the Rancho San Bernardino in 1842. Don Lorenzo Trujillo brought the first colony of settlers from New Mexico to settle on land provided by the Lugos about one half mile south of