U.S. Is Now in Battle for Peace After Winning the War in Iraq
American troops, having won war in Iraq, are straining to manage anger, frustration and competing ambitions of nation long suppressed by Saddam Hussein; new politicial parties, Kurds and Shiite religious groups are asserting virtual governmental authority in cities and villages across nation, sometimes under noses of American soldiers; educated Iraqis eager for American-led transformation fear Americans may be losing initiative; anti-American sentiment remains palpable; photos (M