But last week the Scowcroft Institute of International Affairs at Texas A&M hosted a conference designed to discuss the latest, markedly gloomy world view issued by America's intelligence establishment. Every four years the National Intelligence Council – which oversees America's baroque collection of intelligence agencies – releases a global trends report, which is given to the new president.

The latest report, published on November 20, has made headlines around the world. The front page of Britain's Guardian newspaper shouted “2025: the end of US dominance”. For once, the headline is broadly accurate. As the NIC frankly notes, “the most dramatic difference” between the new report and the one issued four years ago is that it now foresees “a world in which the US plays a prominent role in global events, but the US is seen as one among many global actors”. The report issued four years ago had projected “continuing US dominance”.

The NIC report has made people sit up because it comes from the heart of the US security establishment. But it is part of a broader intellectual trend in America: a “new declinism”. This mood marks a complete break with the aggressive confidence of the Bush years and the “unipolar moment”. Its starting assumption is that America, while still the most powerful country in the world, is in relative decline.