"Operation Iraqi Freedom succeeded in overthrowing Saddam Hussein, but Iraq remains unstable because of Sunni Arab resentment and a related insurgency, compounded by burgeoning sectarian violence. According to its November 30, 2005, 'Strategy for Victory,' the Bush Administration indicates that U.S. forces will remain in Iraq until the country is able to provide for its own security and does not serve as a host for radical Islamic terrorists. President Bush has said he believes that, over the longer term, Iraq will become a model for reform throughout the Middle East and a partner in the global war on terrorism. However, mounting U.S. casualties and financial costs- without clear signs of security progress- have intensified a debate within the United States over the wisdom of the invasion and whether to wind down U.S. involvement without completely accomplishing U.S. goals."
CRS Report for Congress, RL31339
U.S. Department of State: http://fpc.state.gov/