IIRC, the term "bull" applied to a dog dates back to ancient Rome when some dogs were bred for "Bull Baiting."
Mark
Therein lies the rub..."pit bull" is a generic, inflammatory term that control freaks in government and their enablers in the media use for pretty much any vicious dog. Technically speaking the American Staffordshire and the American Pit Bull are the same dog, the former name being applied by the AKC and the latter by the UKC.