He's referring to america... and I have to disagree.
What's so important about an ethnicity that it has to be kept at all costs? Culture is probably worth preserving, but often culture is simply "the way it's always been" -- I'd argue the opposite, bringing different cultures together, if done right, will promote creating new culture that make more sense for today's reality, and not some 19th century status quo. Creation of culture is more important, imo, than maintaining culture -- as the latter can be done with history books while the former is a real policy that might enrich the lives of citizens.
While I agree with this in theory, I'm going to point you to this fascinating piece on some of the ongoing problems that the French tradition of republican laicity is facing from Muslim immigrants, as a general illustration of the conflicts involved:
In summary: the very culture of tolerance and openness towards others itself is sometimes threatened by those it wishes to welcome, and that's a hard problem to solve.
So there is no value in a uniquely Norwegian culture? Or Korean? Or Japanese?
One of the side effects of totally open borders is that human culture might homogenize, with strong bias toward the developing world where birthrates are exceptionally high. I think Indian and Bangladeshi culture are both wonderful, however I do not think they are necessary worth more than Norwegian, Japanese, etc.
There is something about the US that makes it desirable for people to move to the US. When proposing changes to the US, you need to wonder about that that thing is, so you can figure out if/how it will be changed by your new policy.
> What's so important about an ethnicity that it has to be kept at all costs?
If you're from a country that has a great history and traditions, and you are ethnically related to that, then your DNA constitutes a cultural artifact, just like some carving in a museum in your capital city or a traditional folk song. Through ancestry, you are related to the people who made those things.
It would be stupidly inconsistent to preserve those other artifacts, yet to deny that your living DNA has value in connection with them.
What's so important about an ethnicity that it has to be kept at all costs? Culture is probably worth preserving, but often culture is simply "the way it's always been" -- I'd argue the opposite, bringing different cultures together, if done right, will promote creating new culture that make more sense for today's reality, and not some 19th century status quo. Creation of culture is more important, imo, than maintaining culture -- as the latter can be done with history books while the former is a real policy that might enrich the lives of citizens.