2011年12月15日,美国驻伊拉克部队举行降旗仪式,标志着美国历时近九年的伊拉克战争正式画上句号。18日,美军全部撤出伊拉克,美伊合作重心转向安全防务合作。伊拉克在美军撤离后政治危机凸显,教派冲突风险加剧,外部势力竭力填补势力真空,极端势力趁机作乱,未来局势发展变数增多。一、美军全部撤离伊拉克2003年3月伊拉克战争爆发后,美军开始进驻 On December 15, 2011, the U.S. troops stationed in Iraq held a flag-lowering ceremony, marking the official conclusion of the U.S. war in Iraq, which lasted for nearly nine years. On the 18th, the U.S. troops were all withdrawn from Iraq and the U.S.-Iraqi cooperation center shifted their focus to security and defense cooperation. After the withdrawal of U.S. troops, Iraq highlighted the political crisis, the increased risk of sectarian conflicts, the efforts of external forces to fill forces and vacancies, the extremists took the opportunity to chaos and the number of development variables in the future increased. I. All U.S. Troops Evacuated from Iraq After the outbreak of the Iraq war in March 2003, the U.S. troops started to station