[concordDance]

Nope. Check how Frenchness came about (there used to be many languages in the current French borders). Check all the various wars (Napoleonic Wars, Finnish War, WW2, much further back we have Mongol War...).

Germany didn't exist 200 years ago.

Welsh nearly went extinct.

Poland moved hundreds of miles.

The thing that differentiates those European countries from the African ones is mostly age. And even then its not always one-sided.

There's also countries like Vietnam or empires like India which got pillaged just as hard as South Africa or Rwanda.

Also, are you trying to make the point that multi-ethnic societies result in civil war? That goes pretty strongly against current public sentiment.