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Japan and Korea are wealthy and they don't do that. Austria and Switzerland probably don't either.

Japan and Korea are the main exceptions. In Austria and Switzerland, over 26% and over 37% of the population are first or second generation immigrants. Switzerland also has plenty of foreign workers who live on the other side of the border.

I got curious about Switzerland, so I looked on Wikipedia, which says, "As of 2023, resident foreigners made up 26.3% of Switzerland's population. Most of these (83%) were from European countries. Italy provided the largest single group of foreigners, providing 14.7% of total foreign population, followed closely by Germany (14.0%) . . ."

https://en.wikipedia.org/wiki/Switzerland#Immigration

So, they have a lot of immigrants, but they're clearly giving preference to immigrants from cultural backgrounds very similar to them.

Italy and Germany (and France) are also neighboring countries with a common language (IT less so than DE and FR).

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