Where on earth is the United States headed? Has it lost its way? Is the Obama effect, which initially promised to halt the souring of its global image, over? More seriously, is it in some sort of terminal decline? Has it joined the long historical list of number one powers that rose to the top, and then, as Rudyard Kipling outlined it, just slowly fell downhill: “Lo, all our pomp of yesterday / At one with Nineveh and Tyre”? Has it met its match in Afghanistan?