Addictional informatio n (Wiki):

A very athletic cat, American Shorthair has a larger, leaner, and more powerfully built body than its relation, the British Shorthair.

American Shorthairs are a pedigreed cat with strict standards and a distinctive appearance as set by the various Cat Fanciers Associations worldwide.

Originally known as the Domestic Shorthair, the breed was renamed in 1966 to the "American Shorthair" to better represent its "All American" character and to differentiate it from other shorthaired breeds. The name "American Shorthair" also reinforces the notion that the American shorthair is unique and distinct from cats found in streets, neighborhoods and barnyards.

A non-pedigreed shorthaired cat (called a Domestic shorthair) might resemble an American Shorthair, just as another random-bred cat might look like a Siamese, Persian or Maine Coon. The difference, however, is that American shorthairs are a pedigreed cat and are recognized as such by the Cat Fanciers' Association (CFA). [2]

According to the CFA, American Shorthairs are low-maintenance cats that are generally healthy, easy-going and affectionate. Males are significantly larger than females, weighing eleven to fifteen pounds when fully grown. Mature females weigh eight to twelve pounds when they achieve full growth at three to four years of age. American Shorthairs can live fifteen to twenty years, like most felines, and often only requiring only annual vaccinations, veterinary checkups, a quality diet and plenty of tender loving care. These cats have long tails and usually slender bodies.