This is one of the main issues with Africa and what held back growth was the boarders that were drawn did not take into account the various tribes and sub cultures its the same with South Africa and many other african nations. Forcing people under one umbrella and expecting them to get along and be prosperous was always going to be a tough task

Imagine we redrew the lines of Europe and put the french and Germans together, how smooth a transition would that have been?

While some will still hold on to the old ways the rest will eventually start to form a new one but that takes many generations