Itsallover - seignorage and cost of empire
Yes, there are costs to having an empire. One, of course, is the huge cost of maintaining our military, although the overwhelming majority of these costs just flow back into our own economy. Another is that we make enemies, and thus end up suffering 9/11-type attacks.
However, the benefits of empire, at least for now, are much greater. One is seignorage, that is, the "right" to print money that everyone will accept as having real value. How many countries can run huge trade deficits year after year without suffering economic collapse (after all, Argentina never did what we're doing, and look what's happened to them)? The reason we can do this is seignorage. As long as other people will "buy" our money with cars and oil and clothes and televisions, we can keep it up.
When we lose our seignorage privileges, though, and the dollars start flowing back, we'll be in big trouble.