China, most of Europe, Russia, Japan, and the US are all facing slower population growth and an aging population. People still want to come to America. They are pouring in now that Trump is gone. That is a good thing, but it needs to be done with less chaos.
Not too many people are going to rush to China, Russia, or Japan, three countries that are very resistant to outsiders.
In contrast, India ,Africa, and parts of the Middle East have very young populations that they cannot support. Many are unemployed and the governments are poor, weak, and many are corrupt. More migrants and refugees will be attempting to come to Europe and America.
This will either create problems or solve them. Probably both.