Reposting from someone's post:

Reasons for the demise of the state at every stage in China:

Shang Dynasty (1600-1046 BC) : High pleasure, extravagance, waste

Zhou Dynasty (1046 BC - 256 BC) : Local power was strong and tried to suppress the central government

Qin Dynasty (221-207 BC) : The criminal law was strict and not good for the people

Han Dynasty (202 BC-220 AD) : Useless relatives of high officials hold important positions of state

Jin Dynasty (226-420) : People of different races from other countries migrated to China

Sui Dynasty (581-618) : Waging war without restraint

Tang Dynasty (618-907) : Local forces refused to accept central jurisdiction

Song Dynasty (960-1279) : Redundant officials, redundant soldiers, redundant financial expenditure

Yuan Dynasty (1271-1368) : Every ethnic group was treated unequally

Ming Dynasty (1368-1644) : Severe party struggles

Qing Dynasty (1644-1912) : Closed customs ports and closed the country

Republic of China (1912-1949) : arrogant, feeling that he had all the advantages

USA: Has all the points above

商：酒池肉林
周：强国压王
秦：严刑苛法
汉：宦官外戚
晋：五胡内迁
隋：穷兵黩武
唐：藩镇割据
宋：冗官冗兵
元：各族不平
明：党争严重
清：闭关锁国
民：优势在我
美：综上所述

谁懂啊啊，中文只有一点点，翻英文出来这么一大段