Han, Zhao and Wei were divided into Jin. Why is Korea the weakest? The fundamental reason is the level of the rulers. At the beginning of Kim's split, there was not much difference in the basic strength of the three countries, but the rulers of the three countries had different vision and grasp of the current situation. The continuous accumulation of this gap eventually led to South Korea falling far behind the other two countries.

Since the Warring States Period, the state-owned Wuqi Reform and Reform, the state-owned Sun Bin Training and Think Tank, the state-owned Zhao You Riding and Shooting, the state-owned Qi Training, the state-owned Qin Shangyang, Zhang Yi, and others, and Su Qin's advocacy have formed a vertical alliance and the opposite Qin Lianheng. In this period when all countries are seeking changes, South Korea has only been cheered up by Shen Buhai and Xiang Han once.

Shen Buhai is a reformer who advocates "technique". He mainly emphasizes the tactics of the monarch to control the ministers, which is more to strengthen the stability of the Korean monarchy and has little influence on Qiang Bing, a rich country. It can be said that South Korea has never had a large degree of political reform. Strong neighbors such as Zhao, Wei, Qin and Chu occupy the best geographical position, or have advanced systems. How can we resist them? It seems that South Korea, which became powerful during the period of Han Zhaohou and Shen Buhai, was just "the vassals didn't come to invade". In this way, South Korea rejected foreign expansion and domestic changes, and suddenly missed the best opportunity for development.

South Korea, as a place of four wars, is also a transportation hub. At that time, the hegemony of Jin, Chu and Qin took place in central Henan, such as the predecessors of South Korea, Zheng, Cao and Cai. Unlike Chyi Chin, South Korea has a policy of encouraging or restraining business, but it still follows the old system of Kim, but it can't be used in developed businesses.

Of course, we have to admit that the geographical position of South Korea is not very good. After Jin Sanfen, Wei's territory was mainly Hedong, Zhao was Taiyuan Basin, and South Korea was a part of Shangdang Highland and Nanyang. In addition, the three countries each got a piece of land in Hebei. Hedong land is the earliest management, fertile land, and has become cultivated land; Taiyuan was invaded by the Northern Emperor; Shangdang highland is located in the main road of traffic, because there are many mountains and the land is not very flat. So from the beginning, Wei still had certain geographical advantages, and so did Zhao and South Korea.

Shangdang Highland in South Korea is a transportation hub, and its geographical location is really important, but that barren land can't raise enough population for South Korea to dominate. However, when South Korea wants to expand, there is no place to expand, or South Korea may not want to expand at all. At that time, Hebei had been robbed by Wei and Zhao, and the waterway had been dominated by Wei and Qin. Luoyang belonged to the Zhou royal family at that time, and it seemed that it only went south, so South Korea soon annexed Zheng, but further south was the territory of Chu. In the end, South Korea can only survive in this land of the Central Plains.

South Korea's early scientific and technological level is still very high, and the weapons manufacturing industry is also very high. However, due to its poor geographical position, the most important ruler has a low level and finally ranks at the bottom of the three countries.