History
The oldest traces here are prehistoric: the Melka Kunture sites on the Awash River south of Addis Ababa hold stone tools and hominin remains going back well over a million years. For much of the Middle Ages the east belonged to Muslim states rather than the Christian highland empire. The Sultanate of Adal, trading through the port of Zeila, moved its seat to Harar in the 16th century, and from there Imam Ahmad ibn Ibrahim al-Ghazi, known to Christians as Gragn, invaded the highlands in the 1520s and 1530s, until Portuguese help turned the war. His successor, Emir Nur, built Harar's wall.
In the same century Oromo groups, organised under the age-grade system called Gadaa, spread north and east across the central highlands and much of what is now Oromia. Harar stayed a walled city-state under its emirs, then under Egyptian occupation from 1875 to 1885, before Menelik II took it in 1887. Menelik, expanding his kingdom southwards, also founded Addis Ababa in 1886 on the site chosen by Empress Taytu, and the railway to Djibouti, begun in the late 1890s, created Dire Dawa as a new town where the line reached the lowlands.
The Somali-inhabited Ogaden was fought over in the 1977–78 Ogaden War with Somalia. Under the 1995 federal constitution Oromia, Harari, the Somali Region and the two city administrations of Addis Ababa and Dire Dawa became separate units. Oromo protests from 2014 helped bring Abiy Ahmed, an Oromo, to power in 2018, but western and southern Oromia have since seen fighting between federal forces and the Oromo Liberation Army, and the Oromia–Somali boundary saw deadly clashes in 2017–18.
