A Superpower is a nation that can exert influence worldwide and can sometimes force its influence onto nations and people who would rather not be influenced. Even democratically elected governments sometimes find that they can't do what they choose or what their voters want but have to do what a superpower tells them instead. So superpowers are just that bit undemocratic.
In 1944, there were 3 Superpowers, the British Empire, The USSR and the United States. The British colonies were given independence which was a good thing. The USSR broke up which was also good. All we’re left with is American Neo-Colonialism. People outside the United States can't vote in American elections so why should those Americans be telling other democratic governments what to do? China is for practical purposes a super power, what with a nascent little colonial empire in Africa, a puppet regime in Kartoum.