Nearly two years have passed since the last American soldier crossed the Iraq border into Kuwait, ending in quiet ignominy the American phase of a war that had begun in highly ballyhooed “shock and awe” more than eight years before. In Iraq, the sectarian guerrilla war set off by the invasion goes on, the suicide bombers continue their work, hundreds of Iraqis die in horrific violence every month. That most Americans would prefer to ignore this does not alter the reality that we live in a world the Iraq war has made. Before the war, Iraq had served the United States as a check on the revolutionary ambitions of the Islamic Republic of Iran—a “tilt” to Iraq that Donald Rumsfeld had personally set on course, during talks with Saddam in Baghdad in 1983 as President Reagan’s special envoy. It took the American invasion two decades later to make of Iraq an Iranian ally.