Is staffordshire bull terrier an American bully?

The Staffordshire Bull Terriers are known to have great strength for their size. They are stocky and muscular, but should also be active and agile. The breed is the 5th most popular dog in the UK (its place of origin), and it is the only breed to have the Words 'totally reliable' in its breed standard. Furthermore, the Staffordshire Bull Terrier is one of only two breeds from over 190 recognized by the UK Kennel Club to have a mention of the breed's suitability with children. They are concidered a bully but not an American bully.