California, the Last Frontier

acres agricultural American Angeles automobile Baja California Bay area boundary Cali Califor California landscape centers Central Valley century changes cities citizens climate coastal Colorado crops cultural desert discovery of gold districts east eastern economic factor farm federal foreign-born forests fornia geographers geography of California groups Gulf of California increased Indians industry irrigated Klamath Klamath Mountains Lake Tahoe land large numbers largest living located Los Angeles major manufacturing ment metropolitan Mexican Mexico migration miles million miners mining missions Modoc Plateau Monterey Mother Lode Mother Lode Country mountain nation nature northern ocean Pacific Ocean political presidios principal problems production railroad ranchos reached region River route Sacramento San Diego San Francisco Bay Santa Barbara Senate settlement settlers Shasta ships Sierra Nevada significant slopes southern California Spanish square miles state's streams supplies temperatures thousand tion United urban World War II