Gotta at least give Joe Biden some credit...splitting Iraq into 3 was a pretty good idea.
The idea a decade ago, and by the British after the Ottoman Empire collapsed, was a non-sectarian state that did not permit one religious or racial group to dominate. This would be a more healthy outcome than three states, all of whom would be out to get their neighbors. That was the idea, and it might have worked if Obama hadn't thrown it away starting in 2009. Obama released the future ISIS head from prison and then trained and funded them to destabilize Syria. Just as happened when the al Qaeda precursor trained by the Reagan Administration in Afghanistan turned on its benefactor, so ISIL turned on the U.S. ally in Baghdad.