France shows you the answer

‌I actually believe this applies to almost all Western countries referred to as developed nations, such as the US and the UK.
And in the future, Korea will be one of them as well.
Ultimately, immigration policy must be conservative. Above all, racial mixing is the biggest risk.
The fundamental roots disappear. It is the worst-case scenario when mixed-race populations continuously increase and external ethnic groups change their nationality only on paper.
Even in the US, the proportion of Black and Hispanic populations can no longer be reined in, and it will drop to a level where it becomes embarrassing to call it a white nation. Well, France is already ruined.
In that sense, countries like China and India are terrifying when looking 100–200 years into the future.