California has a history of urban innovation, from the earliest missions to the rise of the Gold Rush era in San Francisco, the sprawling metropolis of Southern California and the "technopolis" that emerged in late 20th Century in places like San Jose, San Diego and Orange County.
Today most Californians -- including those in the Central Valley -- live in cities. These cities face many challenges, from growing populations of poor, immigrants to soaring housing prices. Some, like Los Angeles and… more