Chinese history = the world's hardest survival script

- The most concentrated natural disasters: floods, droughts, locust plagues, severe cold, earthquakes

- The largest number of powerful enemies on the periphery: nomadic tribes, powerful nations, and strong powers surrounding it

- The territory is too vast, the terrain too fragmented, too many ethnic groups, too many dialects

- The costs of internal governance, maintaining stability, and unification are the highest in the world