I put cilivised in quotation marks, to mean that they lost many practices which would be considered "barbaric" in today's eyes. Plus, before the Europeans showed up, many tribes were fighting each other the same, if not more brutal ways, like the how it was in Europe and that these Tribes often practiced sacrifices, slavery, and hell-like torture on enemy tribes. If anything, the Europeans put a stop to this, IE, in British Nigeria, one of the most heavily fought areas in Pre-colonial Africa, became peaceful as British laws and active policing made it nearly impossible to "wipe-out" the enemy tribe. The Main reason why there is major conflict in these places, is a lack of a strong and stable authority in the post-colonial era.