Iraq is broken.
Iraq's national-unity government is not united and does not govern. Iraqi security forces, the centerpiece of the U.S.'s efforts for stability, are ineffective or, even worse, combatants in the country's escalating civil war. President George W. Bush says the U.S.'s goal is a unified and democratic Iraq, but we have no way to get there. As Americans search for answers, there is one obvious alternative: split Iraq into separate Kurdish, Sunni and Shi'ite states.
The case for the partition of Iraq is straightforward: It has already happened. The Kurds, a non-Arab people who live in the country's north,...