The recent wars in the Balkans are the result of too many nationalities in too little land, and they didn't involve significant numbers of African immigrants (who typically had the good sense of emigrating to other parts of Europe).
The Balkans are but one recent example. European history is littered with "you might live in the same place and speak the same language but you're not like me because a couple hundred years ago your people were from X".
Europe has the same problems the US does just spread across fewer skin tones.
Or is Emmanuel Macron also wrong when he also said (and I am paraphrasing) "They are Frenchmen" when an American Talk show host said that Black people won the World cup for France?
In our secular societies you are what your nationality is and your race is irrelevant (or should be considered to be) in the eyes of the state and in the UK it is considered rude to bring up someone's race (other than identifying them).
I will accept that we aren't perfect, but perfect is the enemy of good. Bringing up areas of Europe which I obviously wasn't referring to and have been politically unstable for decades now is disingenuous and simply missing the overall point to be a smartass.
Tell that to the Balkans.