Three southern California rushes-the health rush, the land rush, and the orange rush-deserve the kind ofattention historians have lavished on northern California's gold rush. The three booms in the southern portion of the state were not only bigger than the gold rush, they concentrated the state's population in the south. They also played roles in the racially-based social and cultural patterns that developed in the region.
Glen Gendzel. "Not Just a Golden State: Three Anglo ‘Rushes’ in the Making of Southern California, 1880-1920." Journal of the West (2008): 349-378.