Californiano is a culture in After the End. It is part of the Californian culture group.
The people of the Baja peninsula did not "mesh" with those in the Celestial Empire of California. They did not identify with imperial ideals, would not give up their faith, would not speak with the imperial language. Thus, with the One California Policy, the Yudkow Emperors began the colonization of the peninsula, and the creation of the Californiano culture.
Californiano Characters in 2666