More than a decade after the Persian Gulf War, the United States went to war against Iraq for the second time. This conflict grew out of fear and distrust of Saddam Hussein’s suspected chemical and nuclear weapons of mass destruction. A highly inaccurate intelligence assessment contributed to the fear of Iraq’s phantom WMD. Except for Britain, the permanent members of the Security Council opposed the war. George W. Bush put together a coalition of the willing to invade Iraq in 2003. The opening, conventional phase of the intervention went well with Baghdad seized in three weeks. But soon the Pentagon faced a raging insurgency in much of the country, which was divided along sectarian lines of the Sunni and Shiite Islamic sects fighting each other while attacking the US and allied forces. The intractable insurgency proved complex and deeply rooted. By 2006, the Pentagon looked as it was headed toward defeat. Three factors contributed to a turnaround in its fortunes. Chief among these was the Awakening movement in which Sunni Arab tribal leaders crossed over to the American side because of their resentment of Salafi-jihadi militants. The Bush White House adopted a finely-tuned counterinsurgency strategy and surged 28,500 more troops into the fray. During the intense fighting, Bush pushed several elections and a constitution to entrench democracy. Gun battles and street bombings greatly subsided by the time Barack Obama withdrew all US combat troops in 2011.