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Why would somalis in the semi arid desert unite? For what purpose? What would they gain from uniting? There was no resources in the region. Only livestock. Nomadic people historically united to conquer settled people. There was hardly any settled people in Somalia.Yeah, geography can be a big obstacle in centralising rule but it is not impossible. The Arabs managed to do it during the early caliphate period despite their tribalism, although I acknowledge that it was a short-lived phenomenon.
You could give the argument that it was their religious zeal and the memory of the beloved prophet that kept them together in the early conquests. I still feel that these things were part of various other factors though and not the whole picture.