South Sudan had oil and none has been discovered in Somaliland as yet. That could be the reason, I don't know. As for Eritrea, I think their story was different

South Sudan had oil and none has been discovered in Somaliland as yet. That could be the reason, I don't know. As for Eritrea, I think their story was different. The UN recognized their independence before Ethiopia overturned the agreement. They were also lucky, after a long armed struggle for independence, the collapse of the Derg government in Ethiopia somehow aided their agitation. A new government was in power in Ethiopia that itself forcefully overthrew the previous government. Maybe they just didn't want to extend the war at the time. I don't know some of these things but that is how I see it.