“We will be greeted as liberators” upon invading Iraq, Vice President Dick Cheney counseled in 2003 on the eve of the war. He had already relayed a prediction that the streets in Basra and Baghdad are “sure to erupt in joy.”

President George W. Bush declared that there was “no doubt” that Iraq had weapons of mass destruction. Defense Secretary Donald Rumsfeld said that an invasion would be largely self-financing and that it would last “five days or five weeks or five months, but it certainly isn’t going to last any longer.”

So 15 years ago this week, the United States careered into one of the most cataclysmic, expensive and idiotic blunders of the last half-century: We invaded Iraq.

The financial cost alone to the United States will top $3 trillion, according to the estimates of the economists Joseph Stiglitz and Linda Bilmes, or about $24,000 per American household. Some 4,400 American soldiers died in Iraq, along with approximately 500,000 Iraqis, according to a survey and academic study.