With the 20th anniversary of the U.S. invasion of Iraq on March 20, we speak with Oxford University international relations professor Neta Crawford, who says the region is still reeling from the impact of the war. “The story continues. It’s not over,” she says. Crawford is co-director of the Costs of War Project at Brown University, where her latest report pegs the cost of U.S. wars in Iraq and Syria since 2002 at nearly $2.9 trillion. Since the U.S. invaded Iraq in 2003 under the false pretext of preventing Saddam Hussein from developing weapons of mass destruction, more than half a million people have been killed in Iraq and Syria. Millions more were displaced or died from indirect causes like disease. “It wasn’t quick, it wasn’t easy, and it certainly wasn’t cost-free,” says Crawford.