The world is awash with ethnic and religious conflict. Nearly 5 million people have lost their lives and more than 50 million have been displaced in the maelstrom of intergroup conflict since 1990. During that same period, there have been about 60 civil wars and war-like intrastate battles. While ethnic, religious, and cultural fratricide remain a constant global theme, there are regions where preventive diplomacy has avoided, limited, or restrained such hostilities. In some situations, early warning was timely, but no one listened. In others, early warning was converted into effective...