The American Staffordshire terrier also known as Amstaff is a medium-sized, short-coated American dog breed. In the early part of the twentieth century the breed gained social stature and was accepted by the American Kennel Club as the American Staffordshire Terrier in 1936. The name was changed to reflect difference from the Staffordshire Bull Terrier of England.
The Staffordshire Terrier was first bred in the nineteenth century in the English region of Staffordshire. The early ancestors of this breed came from England, where until the first part of the 19th century, the Bulldog was bred in England. Bulldogs pictured as late as 1870 resemble contemporary American Staffordshire Terriers to a greater degree than present-day Bulldogs. Some writers contend it was the White English Terrier, Fox Terrier, or the Black and Tan Terrier that was crossed with the Bulldog to develop the Staffordshire Terrier; all three breeds shared many traits, the greatest differences being in color, and spirit. The cross of Bulldog and Terrier was called by several names, including Bull-and-Terrier Dog, Pit Bull, or Half and Half. Later, it assumed the name of Staffordshire Bull Terrier in England. These dogs began to find their way into America as early as 1870, where they became known as the Pit Dog, then the American Bull Terrier, and still later as the Yankee Terrier
Source of information: http://en.wikipedia.org/wiki/American_Staffordshire_Terrier
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