A majority of Americans surveyed ahead of Wednesday's 10th anniversary of the US-led invasion of Iraq say the war was a mistake, DPA reported.
The survey, conducted March 7-10 with a random sample of 1,022 adults in the United States, found that 42 per cent say the Iraq war was not a mistake.
US forces withdrew completely from Iraq before the end of 2011. During the nearly nine-year US military presence, the United States suffered 4,488 US military deaths and at least 3,400 US contractor deaths.
Britain, which was the chief US ally in the Iraq invasion, lost 179 soldiers.
A Brown University study last week estimated that 134,000 Iraqi civilians died, along with tens of thousands of Iraqi military forces from both Saddam Hussein's regime during the initial conflict and the new Iraqi government established after the invasion, which fought for years against an al-Qaeda insurgency and several other militant groups.
The opposition to the Iraq conflict was down from a 2008 peak, when 63 per cent of US respondents told Gallup that the war was a mistake.