National Amateur Baseball Federation (NABF)
Homepage: www.nabf.com
Rules and regulations: http://www.nabf.com/membership/rules.htm

History:
NABF was founded in 1914 in Louisville, Kentucky, making it the oldest continually operated national baseball organization in the USA. It is a non-profit organization aimed at organizing teams to make them able to represent leagues in national competitions. Thus, NABF has organized leagues throughout the U.S. and Canada with divisions starting at age 10 and under and going through college. To date, NABF hosts over 50 annual regional tournaments, 8 national championship tournaments, and a World Series.

Lately, NABF has offered new competitive opportunities to athletes in the US by hosting national invitational baseball tournaments for individual teams in age divisions 10 and under through the Unlimited age division.