Ethiopia has a long history of conflict among the ethnic groups it comprises. Today, the major groups are Oromo, Amhara, Tigrayans, Gurage, Afar, Somali, Sidama, Hadiya, and Walayita. Oromo is the largest both in terms of population size (40 percent to 50 percent of the Ethiopian population) and land area, but it is the Tigrayans, who only make up 5 percent to 7 percent of the population, who rule.