County of Los Angeles, California, is one of the most populous counties in the United States with a population of more than 10 million people. Established in 1850, the county is governed by a five-member board of supervisors, who are elected by the county's voters. The major industries of the county are international trade, supported by the ports of Los Angeles and Long Beach, motion picture and television program production, music recording and production, aerospace and professional services, such as law and medicine. It is a subdivision of the state of California and offers a wide range of public welfare services, including law enforcement, property assessment, tax collection, public health protection and social services and relief to indigents. The county also offers various other specialized services, such as flood control, water conservation, parks and recreation, and it provides a variety of recreational and cultural activities.