On March 20, 2003, a "coalition of the willing," made up of the U.S. and its allies, entered Iraq. They knew who their enemy was: Saddam Hussein and his Ba'athist army. The coalition made short work of defeating the Iraqi military, but, as everyone knows, the worst was yet to come. The Iraqi insurgency took many forms and made a common cause with Sunni jihadist groups, connected to al-Qaeda. While the U.S. was distracted, fighting the Sunni insurgency, Iran made its move. A Shiite militia, known as the Badr Corps, established itself through Shiite political leaders like Prime Minister Nouri al-Maliki, to allow Iran to eventually control Iraq. Today, twenty years later, the Islamic Republic of Iran is the main political force in Baghdad and pro-Tehran militias operate in Iraq with impunity.No one knows more about how America's intell ...