BAGHDAD - Twilight brings traffic jams to the main shopping district of this once-affluent corner of Baghdad and hundreds of people stroll past well-stocked vegetable stands, bakeries and butcher shops. To many in Amariyah, it seems little short of a miracle. Just six months ago, this mostly Sunni neighborhood was one of the centers of al-Qaida in Iraq operations. The district in western Baghdad was hit by more than a dozen bombings and shootings some days. Few people dared to venture onto the streets. On Tuesday, women shopped and men drank tea in sidewalk cafes. Occasionally, U.S. soldiers walking the...