JRDA US World Cup Teams represent the United States in international junior roller derby events. The Junior Roller Derby Association (JRDA) a public non-profit educational and amateur sports organization that is dedicated to advancing the growth of roller derby through the standardization of rules and goals for existing and new leagues.The mission of JRDA is to nurture bold self-confidence in youth by developing teamwork and athletic ability while treasuring individuality within a culture of integration, encouragement, and service to others.JRDA partners with competitive & recreational junior leagues, communities & schools, mentors & families; to empower youth through the international sport of roller derby.