If you want to know what London was like in 1905, come to Washington in 2005. Imperial gravitas and massive self-importance. That sense of being the center of the world, and of needing to know what happens in every corner of the world because you might be called on - or at least feel called upon - to intervene there. Hyperpower. Top dog. And yet, gnawing away beneath the surface, the nagging fear that your global supremacy is not half so secure as you would wish. As Joseph Chamberlain, the British colonial secretary, put it in 1902: "The weary Titan staggers under the too vast orb of his fate."
