system
A chat on subreddit /r/wallstreetbets
human
Try 4000 years old.

gpt
no \~2,500 before that it was waring states period which isn't technically 'China' but more like their own kingdoms. 
  
 I am sure there are some Chinese historical revisionist who would agree with you, but China hasn't had a well defined boarder at 4000 years old. Only around 2,500 years which is still a shit ton compared to our 200+ is when China had well defined boarders.