In China 80% of people governing the country are descendants of people who use the rule China during the Qing Dynasty 1644 to 1912

Their are genetic factors with 50 to 20% of intelligence being heritage from the parents

What this meant during the time of urbanization and mass education was that peoples that lived in towns

And they have the IQ to go to university which is better 100 to 115 or 115 to 125 it you are doing engineering

Those people would in turn marry people of equal social standing and of educational attainment as well as IQ

Therefore increasing the chances of a more intelligent child our child equal intelligence

Society loves to talk about equality but isn't a quality in regards to IQ I have helped people and work with people

Who have low IQs, learning difficulties as well as within my own family

It's not their fault it's just the limits of the IQ

In the United States with social mobility the people's that can actually achieve something would have moved to the cities and married other high IQ people

The supplies to people's all over the world in the England for example social mobility has not really changed since the 19th century

Just the material conditions