The term China or Chinese did not exist back then. Even the dominate group “Han Chinese” which makes over 90% of current 1.3 billion Chinese population are not “pure” either. Majority were assimilated into the group throughout the history. I know for a fact many frequently talked major minorities throughout Chinese history are no longer there = assimilated.

Although most of these different ethnic groups are eastern Asians, there are certain more diverse groups in north west China where quite some population were from Middle East. Also along the border with Russia, interracial marriages are common. You can’t really tell which side of the border you are on based on the people around you near the border.

More important, China’s economics are what you need to be, looking at. They have low-pay workers and that’s really the key to their success. As standards of living increase, their advantage (the low cost of their products) will decrease.

Most important of all is the fact you’re mistaken. China is not a superpower. It’s a regional power, to be sure, but a superpower is a nation which can influence events through dimplomacty, economics AND threat of military force, across the entire globe. China hasn’t the ability to project conventional military force beyond its borders, and may only threaten nuclear forces for over half the world.

They are rising in success because they work incredibly hard,
The men still adhere to family values and strong work ethics (the females are however a bit on the side of gluttony, westernizing).

China has some diversity. They have the Tibetans, the east eurasians, the koreans from north korea and some gypsies from europe.

Already east europeans are starting to migrate.

China will have to deal with them over the next 15 years.

Hopefully they’ll be much kinder then we were when America was in its industrial beginnings (child labor, slavery, racism, industrial hazards, severe pollution etc..)