In California, the San Joaquin Delta had a major Dutch (incl. Frisian) and Belgian influence, as settlers from those countries arrived in the 1850s, after California obtained statehood. They drained away swamps and created artificial islands known as polders, constructed dikes to back away the Sacramento and San Joaquin Rivers flowing into the San Francisco Bay, also turned them into fertile farmlands and set up inland ports such as Stockton. Also their communities like Lathrop, Galt, Rio Vista and French Camp which were named for Belgians from Belgium are of both French (Walloon) or Flemish origin.