In its largest reconstruction effort since the Marshall Plan, the United States government has spent $53 billion for relief and reconstruction in Iraq since the 2003 invasion, building tens of thousands of hospitals, water treatment plants, electricity substations, schools and bridges. But there are growing concerns among American officials that Iraq will not be able to adequately maintain the facilities once the Americans have left, potentially wasting hundreds of millions of dollars and jeopardizing Iraq's ability to provide basic services to its people. More on Iraq