I see no evidence one government would suffice. There&#x27;s too much diversity in the world, of both the politically fashionable kinds and the kinds that are currently politically unfashionable to acknowledge but don&#x27;t cease to apply because of that. Even the EU is frequently criticized for instance for the difficult-to-the-point-of-impossible task of tying together all of its economies under one currency, just to give <i>one</i> example of major structural issues it raises, and is at the very least under a lot of stress, if not outright coming apart. If you can&#x27;t even integrate Europe you can forget about running the whole world under one government. The EU is your best case.