Historically, both peaceful and violent competition and integration between Oromos and other neighboring ethnicities such as the Amhara, Sidama and the Somali had an impact on politics within the Oromo community. The northern expansion of the Oromos such as the Yejju and, in particular the Arsi, to ethnic Somali and Sidama territories mirrored the southern expansion of Amharas, and helped influence contemporary ethnic politics in Ethiopia. Also the great Somali expansion from the Ogaden plains west towards the Juba river led to conflicts with the Oromo. In some areas, Oromos and Somalis were in competition for fertile territory and natural resources. Additionally, Eastern Oromos, who had adopted Islam, were along with Somalis and Afars part of the Muslim Adal Sultanate, which under Imam Ahmad ibn Ibrihim al-Ghazi led a conquest of the Christian Abyssinian Empire...Read more:Oromo people
Constituted a galaxy of states and polities, each moving in its own orbit, but significantly affecting, and affected by, the other entities in the constellation. Each ruler kept a watchful eye on his neighbors but would often exchange gifts and courtesies with them unless actually at war. Dynastic marriages were made whenever practicable, though these only occasionally crossed barriers of religion. Commerce, on the other hand, made little distinction between faith, and trade routes linked traditionalist, Christian and Muslim localities. Ethnic and linguistic communities remained largely distinct, but there was much cross-fertilization of cultures. This was true not only off the Ethiopian highlands and the Red Sea coastlands, but also further south along the Somali-Oromo frontier where later nineteenth century travelers reported the existence of bilingual trading communities...Read more: Oromo people