Question: What has been the predominant form of government of the nation home to the ethnic group of Africa known as the Oromo ?

text: List of ethnic groups of Africa
Lists -- Major ethnic groups

The ethnic groups of Africa number in the thousands, with each population generally having its own language (or dialect of a language) and culture. The ethnolinguistic groups include various Afroasiatic, Khoisan, Niger-Congo and Nilo-Saharan populations. The official population count of the various ethnic groups in Africa is highly uncertain, both due to limited infrastructure to perform censuses and due to the rapid population growth. There have also been accusations of deliberate misreporting in order to give selected ethnicities numerical superiority (as in the case of Nigeria's Hausa, Fulani, Yoruba and Igbo people). A 2009 genetic clustering study, which genotyped 1327 polymorphic markers in various African populations, identified six ancestral clusters. The clustering corresponded closely with ethnicity, culture and language. A 2018 whole genome sequencing study of the world's populations observed similar clusters among the populations in Africa. At K=9, distinct ancestral components defined the Afrosiatic-speaking populations inhabiting North Africa and Northeast Africa; the Nilo-Saharan-speaking populations in Northeast Africa and East Africa; the Ari populations in Northeast Africa; the Niger-Congo-speaking populations in West-Central Africa, West Africa, East Africa and Southern Africa; the Pygmy populations in Central Africa; and the Khoisan populations in Southern Africa.
Major ethnic groups Region Countries Language family Pop . ( millions ) ( year )
Akan West Africa Ghana , Ivory Coast Niger-Congo , Kwa 20
Abyssinians Horn of Africa Ethiopia , Eritrea Afro-Asiatic , Semitic
Amhara Horn of Africa Ethiopia Afro-Asiatic , Semitic 22 ( 2007 )
Chewa Central Africa Malawi , Zambia Niger-Congo , Bantu 12 ( 2007 )
Fulani West Africa Mauritania , Gambia . Guinea-Bissau , Guinea , Nigeria , Cameroon , Senegal , Mali , Burkina Faso , Benin , Niger , Chad , Sudan , CAR , Ghana , Togo , Sierra Leone Niger-Congo , Senegambian 20
Hausa West Africa Nigeria , Niger , Benin , Ghana , Cameroon , Chad , Sudan Afro-Asiatic , Chadic 43
Hutu Central Africa Rwanda , Burundi , Democratic Republic of Congo Niger-Congo , Bantu 15
Igbo West Africa Nigeria Niger-Congo , Volta-Niger 34 ( 2017 )
Kanuri Central Africa Nigeria , Niger , Chad and Cameroon Nilo-Saharan , Saharan 10
Kongo Central Africa Democratic Republic of the Congo , Angola , Republic of the Congo Niger-Congo , Bantu 10
Luba Central Africa Democratic Republic of the Congo Niger-Congo , Bantu 15
Maghrebis North Africa Maghreb ( Mauritania , Morocco , Western Sahara ) , Algeria , Tunisia , and Libya Afro-Asiatic , Semitic 100
Mongo Central Africa Democratic Republic of the Congo Niger-Congo , Bantu 15
Nilotes Nile Valley , East Africa , Central Africa South Sudan , Sudan , Chad , Central African Republic , Kenya , Uganda , Tanzania , Ethiopia Nilo-Saharan , Nilotic 22 ( 2007 )
Oromo Horn of Africa Ethiopia Afro-Asiatic , Cushitic 3 5 ( 2016 )
Shona East Africa Zimbabwe and Mozambique Niger-Congo , Bantoid 15 ( 2000 )
Somali Horn of Africa Somalia , Djibouti , Ethiopia , Kenya Afro-Asiatic , Cushitic 20 ( 2009 )
Yoruba West Africa Nigeria , Benin , Togo , Ghana , Ivory Coast , Sierra Leone Niger-Congo , Volta-Niger 40
Zulu Southern Africa South Africa Niger-Congo , Bantu 12 ( 2016 )