The United States public's opinion on the invasion of Iraq has changed significantly since the years preceding the incursion. For various reasons, mostly related to the unexpected consequences of the invasion, as well as misinformation provided by US authorities, the US public's perspective on its government's choice to initiate an offensive is increasingly negative. Before the invasion in March 2003, polls showed 47–60% of the US public supported an invasion, dependent on U.N. approval. According to the same poll retaken in April 2007, 58% of the participants stated that the initial attack was a mistake. In May 2007, the New York Times and CBS News released similar results of a poll in which 61% of participants believed the U.S. "should have stayed out" of Iraq.

The Iraq War, sometimes called the Second Persian Gulf War was a protracted armed conflict in Iraq from 2003 to 2011. It began with the invasion of Iraq by the United States-led coalition that overthrew the Ba'athist government of Saddam Hussein. The conflict continued for much of the next decade as an insurgency emerged to oppose the coalition forces and the post-invasion Iraqi government. US troops were officially withdrawn in 2011.