sentences:  U.S. National Dancesport Champions (Professional 9-Dance)
  
  The United States national professional ballroom dance champions are crowned at the United States Dance Championships (formerly USDSC, and USBC), as recognized by the National Dance Council of America (NDCA) and the World Dance & DanceSport Council (WD&DSC).The 9-dance division consists of American-style smooth waltz, tango, foxtrot, Viennese waltz and rhythm cha cha, rumba, East Coast swing, bolero, and mambo.