The capital is Sacramento. The fluid nature of the state’s social, economic, and political life—shaped so largely by the influx of people from other states and countries—has for centuries made California a laboratory for testing new modes of living. California’s population, concentrated mostly along the coast, is the most urban in the United States, with more than three-fourths of the state’s people living in the Los Angeles, San Francisco, and San Diego metropolitan areas. Despite its urbanization and the loss of land to industry, California still leads the country in agricultural production. About one-half of the state’s land is federally owned. National parks located throughout the state are devoted to the preservation of nature and natural resources.