Answer
The Ogaden is a region in eastern Ethiopia that was disputed between Ethiopia and Somalia during the rule of Mengistu Haile Mariam. The Ogaden was historically part of Ethiopia, but was claimed by Somalia in the 1970s. The two countries fought a war over the region in 1977-78, which Ethiopia won. The Ogaden remains part of Ethiopia today, but there is still tension between the two countries over the region.