I think I remember ancient Athens had some troubles with their allies, that (not without some reason) more and more began to think about athenians as arrogant bullies rather than true allies. And then Rome, that even had a war about their relations to their "partners". Could it be part of a general trend - former "first among equals" getting into some "state of hubris"? And, yes, I don´t only think about the past, though our discussion is about history, such thinking of dominance seems not at all to have got out of fashion. "If our allies don´t do what we want, then it is their problem. Good riddance."