In a sense, their true enemy was less America than an arrogant future to which a vain country lay claim. This was a country that named the previous hundred years the American Century. So as much as the 19 men, who commandeered four airliners nine months, eleven days, and nine hours into the next century, despised America—despised its "pure products [that] go crazy," as William Carlos Williams described them, including a rowdy pluralism, a heedless innovation, an irreverent culture, and a reckless dream that the country named as surely as it named centuries—these men despised the way such American things were expressions of the modern age. They flew those airliners into the clock of the new century to shatter its face, wreck its watchworks, still its hands, and blast into space its numbers, and in every way that they meant to succeed, they failed. Whether they succeeded in other ways that matter more remains to be seen. America gets the politics it deserves more than we know. A nearly...