It’s not a “choice” Europe has made. That’s what they are. Most European countries, as a matter of history, are ethnic tribes with flags, similar to Japan or Bangladesh or Israel.
Everything is a choice. There are differences in immigration, work visa, citizenship, social security, etc laws that perpetuate these choices. But these laws are downstream of the local culture desiring this.
Japan didn’t just end up with 97-99% Japanese population by accident.
Japan didn’t just end up with 97-99% Japanese population by accident.