In 1991, Eritrea won a 30-year war for independence from Ethiopia, and in 1993, it was recognized as Africa's newest nation after more than a century of conquest and occupation by a succession of external powers that included the Ottomans, Egypt, Italy, Great Britain and Ethiopia. Each had left its mark, while fostering a deep distrust of outsiders and a fierce commitment to Eritrea's separate political identity. Eritrea and Ethiopia slipped into...