Russia and other countries that are not attractive to your average migrant will suffer from population crisis but the US will not, because the US has millions of people living south of it's border that are willing risk their life to get a chance to work there, once the labor shortage becomes acute, the working visas will start flowing. Most western countries will have a social and ethnic crisis rather than just a population crisis because of the need for more and more migrant workers. Japan has a very strict immigration policy and that's why they haven't manage to find a solution to their population crisis and demonstrates that you either accept migrants and keep growing or you stagnate.
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