Ancient Egypt or Mesoptamia most likely. But they didn't use the term "superpower" then.
The Spartans ushered in an era of prosperity as Greece's first military and economic superpower.
The US built it, but was not quite a superpower at the time. The US and USSR became superpowers a few years after the war.
No, Vietnam is not a superpower.
A superpower in recovery maybe.
Greece
Mycenaean civilization ushered in an era of prosperity as Greece's first military and economic superpower.
Superpower is a fighting type move.
Flareon learns Superpower by Move Tutor.
I'm assuming you're on Superpower island in poptropica...if you already have your superpower you use it to defeat Betty Jetty. If you don't have it, you need to defeat all the other villains first.
The Move Tutor can teach Luxray Superpower.
It expanded the empire of the Assyrians and Babylonians to stretch from Libya to Central Asia.