Scarred by decades of conflict and occupation, the craggy African nation of Eritrea has weathered the world's longest-running guerrilla war. The dogged determination that secured victory against Ethiopia, its giant neighbor, is woven into the national psyche, the product of a series of cynical foreign interventions. Fascist Italy wanted Eritrea as the springboard for a new, racially pure Roman empire, Britain sold off its industry for scrap, the United...