Prolonged violence in the Horn of Africa, the northeastern corner of the continent, has led growing numbers of Ethiopians, Eritreans, and Somalis to flee to the United States. Despite the enmity created by centuries of conflict, they often find themselves living as neighbors in their adopted cities, with their children as class-mates in school. In many ways, they are successfully navigating life in their new home; however, they continue to struggle to bridge old ethnic divisions and find salaam,...