For the Chinese it won't be until the 22nd century that they will recover

Funny thing the Chinese Communist party may go down as the worst government in human history

China's long history as being of division and then being United for breaking apart again

China is not a nation state it's a civilization

The closest modern comparison is India and the english-speaking people thought the are over the next centuries

Will be growing further apart in language and culture just due to normal civilizational drift

Nations will be pora and the age of plenty will come into an end because look at the technological economic miracle of the 20th century after world War two

Something like that can only happen once and people's happiness is relative for generation after generation for the past three generations

Life has gotten much better for each generation and historically that trend will be flat

Before industrialisation of the 18th, 19th and 20th centuries

The UK and Europe to a lesser extent have used immigration to try and repopulate their population

The are not actually dealing with the problem and we are not getting the best immigrants with the best IQ which is a very controversial topic

Here is a link to an article which touches the topic of IQ https://jonathanrileywriter.medium.com/sex-relationships-technology-and-iq-6d136e808daf

It's more relationship focused I do have one more focused on immigration and it's prose and cons to society

If you do get the chance I do recommend reading Germ, Gun and Steel by Jared Diamond

It's a tough dress but you may find it interesting