History is written by the winners, I guess, and all that pro-US propaganda that's so proliferate in the entire western world seems to be working really good.
Did you know that the US supported Hitler at first and big US corporations (I.T.T., General Motors, DuPont, Standard Oil of New Jersey, Davis Oil Co., and the Chase National Bank) all continued trading with Germany during the war because there was money in it and the US politicians didn't want to give those big corporations a big sad?
The US is the "global peacekeeper" only when the target country they're invading doesn't want to go along with whatever the US wants. The UN is a whole lot more global peacekeeper than the US will ever be.