The same applies to imperialism. Because of its sheer size and resources, whatever the US does will have repercussions around the world - just like an elephant moving in a china shop. But imperialism is more than having repercussions - its an intent to exert influence outside a country's borders. And it would be utterly naive to presume that even the smallest countries do not have such an intent.
In that context, is the US more imperialist than other countries - if we control for the size of the country?
wojtek