Second, the reason:
1 and 15 centuries ago: politically, China was unified and the political situation was stable for a long time; Economically: the development of productive forces and agricultural civilization; Cultural education: economic and cultural exchanges between ethnic groups, learn from each other's strengths; Education and the development of imperial examination; Foreign policy: opening to the outside world and so on.
2./kloc-after the 0/5th century: politically, the feudal system became increasingly decadent, which was manifested in the abolition of the prime minister in the Ming Dynasty and the establishment of the Ministry of War in the Qing Dynasty; Economically, we continue to adopt the policy of emphasizing agriculture and restraining business, which makes China lag behind the trend of world development; Cultural autocracy; In foreign relations: closed to the outside world.