Many ethnically diversified countries favored federalism as a best means of accommodation for linguistic, cultural and territorial autonomy interests of their people. Accordingly, Ethiopia has adopted ethnic based federalism since 1991 which enabled some ethnic groups to establish their own sub-national governments (regions). Yet this system hardly became attractive for internal national minorities (i.e. an ethnic groups who forms majority in one region but minorities in another region) since the procedure of protection controlled by regional majorities and high degree of systematic...