[Republic If You Can Keep It]

The establishment of colonies by Europe in Africa drew borders which cut across tribal borders, thereby artificially uniting enemies in one country still today...

True enough. But there are now an estimated 2,000 tribes & some countries have up to 200 in significant numbers within their borders.

Suppose the current borders didn't exist. How could they be redrawn/improved?

Who would preside over such a process & how would agreement be reached?

[norton]

"Suppose the current borders didn't exist. How could they be redrawn/improved? Who would preside over such a process & how would agreement be reached?"

Bloodshed followed by petty rivalries and alliances leading to a long process of imperial expansion followed by larger scale wars and ... oops ... colonies comes to mind.

[Ironfocus]

Virtually impossible, I should think. They would still be fighting.