what is the difference between an alsatian and a german sheppard?

German Shepherd Dog or Alsatian (see Breed names), is a popular breed of dog. German Shepherds are highly intelligent, agile and well-suited to active working environments. They are often deployed in various roles such as police work, guarding, search and rescue, therapy and in the military. They can also be found working as guide dogs for the blind. Despite their suitability for such work, German Shepherds can also make loyal and loving pets inside the home. They enjoy being around people and other animals, although socialization is critical for young puppies in order to prevent aggressive and dangerous behavior. German Shepherds are well-suited to obedience, with advanced and prestigious titles available to test both the handler and dog in various schutzhund trials.

http://en.wikipedia.org/wiki/German_Shepherd

Brit versus US?