Not until we have one sovereign global government will we have world peace. In the US we have so many different cultures and yet we managed to govern as one nation for all. The real danger is who do we want to lead such a global federation of United Nations? North Korea? Palestine? UAE? Amsterdam? Or US?
If you consider that barbarisms such as public stonings, child marriage, witch hunting, etcetera are still practiced in some of the places I mentioned and elsewhere. Who else is more capable of leading the world than US? The USA has a formidable constitution that sows freedom for all people of all backgrounds and in due time the entire world will have such freedoms reflective of the virtues of our nation. (So what) if we spill a little blood here and there- so long as it is not our own blood on the threshing floors of the world- if there is no other way, then the bloodletting must be done for the greater good. The goal is to heal the fractures of our global community and to bring about one spoken and written language (aside from mathematics and economics) that brings communities together- and which will cut out the room for mistranslation and loss of translation. Besides, the gods would envy us for speaking one tongue. And let them be envious, so long as they do not resort to Old Testament terrorism.