Does your world have any "Superstates?"

Definition: "a large and powerful state or union formed from a federation of nations."

Examples of Superstates in fiction include Oceania, Eurasia, and Eastasia from 1984. As well as the Coalition of Ordered Governments and Union of Independent Republics from Gears of War.

If the answer to the question is "yes" then cool! Got a couple follow-up questions to that.

How did your Superstate(s) come to be? What nations make them up? How much of your world do they have under their control? How long have they been a Superstate for? What is their governing body like: are they totalitarian dystopias, utopian paradises, or somewhere in betwee? And are their any nations that rival them in the world/universe?