Rubbish. The concept pre-dates the existence of the USA (it even played a role in it’s formation).
What I mean is that this concept is politically insignificant today in Europe (at least in France, I am not familiar enough with others). We do not use the concept of "race", this is not how we see the world: the concept fell out of favor even before the ww2 and it became taboo after it.
Our far-right is about culture, religion and identity, not genes. Anecdotally you can hear an individual alleging the inferiority of Africa's IQ or the consequences of incestuous weddings in Muslim tribes, but it is anecdotal and it is still not about the superiority of white people.
Moreover understand that Muslims look a lot like Southern Europeans. And we do have few black people because slavery was mostly non-existent on the mainland.
Ironically, the liberal Hollywood is currently the main source spreading racialist and esentialist perceptions to Europe. If you hear a Frenchman using the word race, odds are very high that he is an avid consumer of US series and medias, or spent some years in the USA.
On that basis, do you believe emigration should be halted too?
No. I am liberal on most of issues and I do not desire to restrain my compatriots' rights. Regrettably Islam put us with the back on the wall and we now have to embrace radicalism if we want to survive, hence why I have this intolerant attitude towards them.
Moreover few French people emigrate and most eventually come back later with a precious experience and foreign assets, like I did myself. Among the permanent emigrants we find many Muslims and other pseudo-French citizens that I am happy to let go.
Similarly I regret that we reached a point where we have so many undesirable immigrants that as a result we will have to close our doors to great immigrants that we had welcome in better times.
Surely it would be wrong for a government to refuse to accept diversity within their own borders while permitting their citizens to go and create it elsewhere?
It is the business of every country to decide whether it wants them or not.