Since the end of the World Wars, the term "great power" has been joined by a number of other power classifications. Foremost among these is the concept of the superpower, used to describe those nations with overwhelming power and influence in the rest of the world. It was first coined in 1944 by William T. R. Fox and according to him, there were three superpowers: Great Britain, the United States, and the Soviet Union. But after World War II Britain lost its superpower status. The term middle power has emerged for those nations which exercise a degree of global influence but are insufficient to be decisive on international affairs. Regional powers are those whose influence is generally confined to their region of the world.