oromo don't have intelligent design in regard to how they expand, they just have a boat load of kids. i remember this article about a muslim man in Bale who had 9 wives and over a hundred children. they are not choose about whom they add to their nations and they live in the most fertile land in horn of africa. they are predominately poor farmers. when they run out of land, they encroach on the land of others. over the course of 100 years, they have taken DirDhawa, Babila and all the land around the city of Harar. at one point we lived on the Plateau, east and north of the city now we are a strictly lowland phenomenon.