Answer:
Through people and Hijarat.
Explanation:
Muslims introduced and expanded Islam in Ethiopia and the Horn when the Muslims Hijarat to Ethiopia and the Horn. Due to daily activities of Muslims with the non-Muslims of Ethiopia and the Horn, the people greatly affected which leads to the spread of Islam in Ethiopia and the Horn. Christianity first came to Ethiopia in the Aksum Empire in the fourth century A.D. The Christianity was introduced by Greek-speaking missionary whose name is Frumentius that converted King Ezana. In this way, Christianity and Islam introduced and expanded in Ethiopia and the Horn.
