China came first , then some poor criminal minds kept moving around , some went to Japan some went to VietNam and some settled in Korea
Cultured , sophisticatted people remained in China , that is why they have a rich cultural heritage
Japan, Korea etc Vietnams these were some what smaller minded folks they fought with each other for many years
Event when we look at the Martial arts
Kung Fu is pretty much understood to be more elegant , more complete form of Martial Arts
Most of the Mathematical genius and Cultural text have originated from Chinese
Advancement in Science , and farming rice and many dishes all originated from Chinese culture
I mean with out Doubt , China is far superior as a nation culturally and as people and group
Japan was origionally inhabitted by Indigneous people
I think Japan some where thru history forgot the connection with mainland and developed its own variation of culture