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 American Rhythm division consists of American-style cha cha, rumba, East Coast swing, bolero, and mambo.
References
U.S. National Dancesport Champions (Professional Rhythm) Wikipedia(Text) CC BY-SA