WI if the world had setup a real UN?

What if the world had put together a real world governing body with a real army, taxes, Super Majority rule instead of the veto? It also included a way to add new world powers as they develop.

Now I know there is not much chance of this having actually happened, but how would our world look if it had?
 
It would fail soon after for a variety of reasons, and after a few brief bloody wars, the world goes on.
 
What if the world had put together a real world governing body with a real army, taxes, Super Majority rule instead of the veto? It also included a way to add new world powers as they develop.

Now I know there is not much chance of this having actually happened, but how would our world look if it had?
Majority by what? Population (China pretty much rules the world)? Number of countries (Gives 10th rate African hell hole the same power as the US or USSR)? Something else?
 
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