It has. UK is a shining example of that. I lived in an immigrant community in Boston, Linconshire. The entire town is just one big nest of immigrants. Then I moved to other area.
The difference was vast. In the former example, I felt like I was home. The only place where I heard English was on the radio from cars. Otherwise, the most typical Eastern European town.
I wasnt ''in'' UK for about 7 months.
And then some wonder why that town voted overwhelmingly Brexit.
And as someone who also lived in Latvia for three years, the damage that their national character, culture has sustained because of the massive Russian immigration during the USSR era is irreparable. They will never recover from it. And the divisions in that society are frightening. It reminds of how my little Swedish town is starting to look like. Self-imposed ethnic and religious isolation, increasing every year. It is frightening.
I have had quite a long live, most of my it living abroad. Immigration is no joke. It is not something as mundane as change of weather as some people talk about it in this thread.