China consists of many nations. They have many internal problems. They still use hieroglyphs, because it doesn't keep phonetics. There are many languages inside China. China provides assimilation politics. So in Tibet and East Turkestan locals fight (death is common) with settlers.
If you show this map in China you can go to prison. http://s.lurkmore.to/images/1/1b/China_map.jpg
Only one child is permitted in family (you should pay for others). So when it is girl, they often do abortion. There are one girl for 5 boys in China today.
China is buying Africa. When all were looking to Libya, France made 4 revolts to establish puppets.
About military strength, "China can not into war". They have never won wars. They are buying middle Asia (exUSSR republics). You can read about First Socialistic War (Vietnam-China).