As time went on, the Bureau began to refer to the tribe as the Morongo Band of Mission Indians.

The first official 'Captain' of Potrero Ajenio (aka San Gorgonio Agency), recognized by the Bureau of Indian Affairs, was the hereditary leader of the Maarrenga, known to Americans by his English name, John Morongo. The name Morongo is derived from the Serrano clan, Maarrenga.

Approximately 954 of the 996 enrolled tribal members live on the reservation. Grant established this and eight other reservations in the area by executive order. Reservation Location of Morongo Reservation The tribe has developed a large casino and hotel resort at Cabazon to generate revenues for tribal welfare and economic development. Grant, and called Malki by the Native Americans, the Morongo name was adopted by 1908 when the land was patented to the Morongo Band of Mission Indians. Established as the Portrero Reservation by executive order in 1876 under President Ulysses S. The Morongo Reservation is located in Riverside County, California in the San Gorgonio Pass. Although many tribes in California are known as Mission Indians, some, such as those at Morongo, were never a part of the Spanish Missions in California. Tribal members also include Cupeño, Luiseño, and Chemehuevi Indians. The main tribal groups are Cahuilla and Serrano. The Morongo Band of Mission Indians is a federally recognized tribe in California, United States. Other Cahuilla, Cupeño, and Serrano peoples Moravian Church on the Morongo Reservation

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