The USA has 15.4% foreign-born population. Compared to Asian tech powerhouses, Japan has 2%, South Korea 2.3%, and China 0.1%. And they don't grant citizenship to children of immigrants.

And just eyeballing it, you'll notice most countries demographics don't radically change in the span of a generation.

https://en.wikipedia.org/wiki/List_of_sovereign_states_and_d...