From The Guardian, via Mathaba,net (link):
The world is in the midst of a monumental process of change that, within the next 10 years or so, could leave the US as only the second largest economy in the world after China and commanding, with the rise of China and India, a steadily contracting share of global output. It will no longer be able to boss the world around in the fashion of the neoconservative dream: its power to do so will be constrained by the power of others, notably China, while it will also find it increasingly difficult to fund the military and diplomatic costs of being the world’s sole superpower. If the US is already under financial pressure from its twin deficits and the ballooning costs of Iraq, then imagine the difficulties it will find itself in within two decades in a very different kind of world.
