Nouri al-Maliki may have agreed to step down as prime minister of Iraq on Thursday, but the damage he has wrought will define his country for decades to come. The stunning collapse of the Iraqi state in its vast northern and western provinces may be Maliki’s most significant legacy. After nine decades as the capital of a unitary, centralized state, Baghdad no longer rules Kurdistan, nor Fallujah, nor Mosul, and might never rule them again.