[5] After he started serving travelers in 1849 on the Southern Trail, Warner set up the only trading post between New Mexico and Los Angeles.

After California became part of the United States, taxes were imposed on the Cupeño, one of a series of issues that led in 1851 to the Garra Uprising.

Warner moved his family to Los Angeles but continued to manage the ranch for years.

[1] The Cupeño gained no legal remedy to their issues but remained settled around the hot springs, to which they charged some travelers admission.

[4] They filed suit against him, but lost in federal court in 1901 and were forced to relocate in 1903 to the Warner Ranch Indian Reservation[6] located in Pala Valley about 20 miles away.