This will show the migration and IQ as it reached more northern countries.
Those who ended up Chinese splintered off, and their high IQ stemmed from their concept of "biopower" which has ancient roots in the concept of "yousheng" ("good birth"—which has the same literal meaning as "eugenics").
For over a thousand years, China has been ruled by a cognitive meritocracy selected through highly competitive exams.
The brightest young men became the scholar-officials who ruled the masses, amassed wealth, attracted multiple wives, and had more children.
The current exams for university admission, taken by more than 10 million young Chinese per year, are the updated version of these imperial exams and are the route to educational, occupation, financial, and marital success.
With the relaxation of the one-child policy, wealthier couples can now pay a "social fostering fee" to have an extra child, restoring China's traditional link between intelligence, education, wealth, and reproductive success.