Called a country "The superpower of it's day" is very different from calling it a superpower in the modern sense. The U.S., Soviet Union, and the U.K. were the only nations to be called superpowers so that is all this article should talk about, that and "Potential Superpowers". If you want to talk about the Spanish empire why don't you add it to the Great power page where it will be better suited? User:Daniel_Chiswick 16 April, 2007.