A Perpetual Killing Field: South Sudan, where civil war never ends.

The western powers pressured Sudan's Islamist dictatorship to let the south have independence. But I have never seen an accusation that they exploited or oppressed people in South Sudan. The disaster does not seem to be caused by any western crime. However, I suspect that the civil war is fueled by oil exports.

Groups of Nuer and Dinka were perpetually raiding each other in the 1930s when Evans-Pritchard studied them. They stole cattle, and they took prisoners and sometimes killed them but not always. They used traditional weapons, not submachine guns, and neither group was united under overall leaders. It seems that things are much worse now.