Some Malaysian guy working for the UN in Congo said it not me.
The problem is tribal regions in Africa are so small that the countries would be tiny. Plus there is a lot of aggression between the different tribes, they have been at war forever but luckily when guns got to the country it was with the whites keeping law and order. They stopped a lot of tribal conflicts m. When the whites left all this tribal conflicts resurfaced and genocides happened but now with guns.
It's not like anyone even today and can say what the borders should have been. Sure there are mistakes and there would be an issue with borders however they are divided. But at some point it's what's you got and how you got to deal with it.
Malaysia is a very "divided" country with Chinese, Indians, Maylays but they aren't a divided country.