That's not true. The current administration has written large amounts of literature talking about what it wants to do, describing how it wants to maintain American dominance. You think they haven't said it? Go and check out the horses mouth.
Project for a New American Century (It's one of those conserative think tanks). Think this organisation is just a bunch of nutters? Think again . Dick Cheney, 'the don' Rumsfeld and Paul Wolfowitz all belonged to it. Apparently they are a bit busy at the moment to maintain their membership... Others would argue that they are pursuing these goals in a less theoretical fashion.
Of course they don't talk about it on the news. They are much more interested in talking about gay marriage and abortion. Ya know, the important issues.