Well, it all depends on the period of time we're talking about.
If we're talking about now - then, yes, the US would own any opponent - although it's interesting to note than the one country that offers the best chance of actually landing on the US, is the US's closest ally, and would probably be fighting on the same side, anyway.
But, if we look into the future - when the EU is further integrated, the EU will become a superpower economically, which will make way for it to become a superpower militia wise, too. (And for those doubting the odds of this, there have already been plans put forward which ams to work towards an EU army).







