However, the first true national occurred on March 30, 1975 in Phoenix, Arizona. This was the major first race held outside of California and in which national points were given both to those who raced outside and within of the state of California. The national would be held in the sanctioning body's one non-Californian track in Phoenix, Arizona (the Kartland Track located at 3610 West Indian School Road) and its members could race in a sanctioned event based in Arizona if they wished to come. This was in addition to many other first including the first BMX National number one Amateur racing title holder which was David Clinton. In 1976 the NBA created the first formal pro class and had its first No.1 pro, a twenty-year-old Scot Breithaupt. However, the first mention of a professional class by the NBA was in the October 1974 issue of "Bicycle Motocross News" at the Valley Youth Center track in Van Nuys, California:  ""A new professional class for 14 and over experts is in effect"  This beats a previous claim of a proto-Pro class that was created in 1975 was when a pro race promoted by Scot Breithaupt at the Saddleback Park track in Irvine, California with a US$200 purse. However, Tom Lund, the alleged pro denies this ever happening:  ""Scott keeps telling me I won the 1st Pro race at Saddelback, he promoted it but I don't remember."" ---Tom Lund, February 24, 2003 FatBMX.com  The NBA for the first six years of its existence it ruled the BMX world with these innovations despite the rise of other sanctioning bodies. However, it closed its doors as an independent BMX governing body nine years after its founding due to falling membership and local tracks changing their affiliations to either the National Bicycle League (NBL) or American Bicycle Association (ABA) (see below). The final independent NBA Grand National held in Long Beach, California in 1981 and was the lowest attended since the NBA went national in 1975. The bulk of the Novice classes was not signing up for the big events, while Expert and Pro turnout was very good (there was no Intermediate or equivalent classes at the time). Overall a mere 600-700 (with 101 motos) sign ups were on hand for the NBA's season ending event. Over the previous season, sign ups never exceeded 750, At the time 1000 sign ups were the standard measure of a good turn out in for an average national during the season.