The document outlines key events in the U.S. occupation of Iraq from 2003 to present day, including the initial invasion and toppling of Saddam Hussein's statue, the rise of an insurgency, torture scandals at Abu Ghraib, elections and establishment of an Iraqi government, continued violence including the bombing of Shiite shrines and killing of al-Qaeda leader Zarqawi, Saddam Hussein's trial and execution, the U.S. troop surge in 2007, and the eventual withdrawal of U.S. troops in 2011 while violence and instability continued.