The population of Asia is at the same level today: between 4 and 4.5 billions, and while there is quite a lot of immigration relatively speaking, you don't see

The population of Asia is at the same level today: between 4 and 4.5 billions, and while there is quite a lot of immigration relatively speaking, you don't see hundred of millions of immigrants. That's partly because the economy has soared at the same time as the population. And the same reasons who are slowing down Africa's population growth (rise of education) should increase its economic growth. It's difficult to see now of course because Africa is more unstable and fragmented than East Asia. But a lot of countries in Subsaharian Africa are not worse off than China in the 1990s and have a promising gdp growth rate (not as big as China yet, though)