In fact, the main reason is that the rulers of the Northern Song Dynasty and the Southern Song Dynasty were very weak. Therefore, when confronting the nomadic people in the north, they often end in failure. In addition, at that time, the Song Dynasty attached great importance to civil servants and paid little attention to military affairs. Therefore, it also caused the phenomenon of valuing literature over martial arts in the Song Dynasty. In addition, the nomadic people in the north were very powerful at that time. Therefore, it also made the Song Dynasty unable to resist the nomadic people in the north. So we can see that the Northern Song Dynasty and the Southern Song Dynasty were finally wiped out by nomadic people.

But as we all know, in the Song Dynasty, economic development actually got a rapid development. This also made the Song Dynasty the most economically developed country in the world. Later, the shipping industry in the Song Dynasty was also very developed, opening up the Maritime Silk Road. However, with such a strong economic strength, it has not vigorously developed military forces to protect homeland security. For the nomadic people in the north, they only seek peace with one heart. And they often cede land and pay reparations to strengthen the enemy.

Of course, the biggest problem in the Northern Song Dynasty and the Southern Song Dynasty was that the rulers were very incompetent and the corruption of officials was very serious, which made the combat effectiveness of the army decline seriously, although the economy was very developed at that time. Therefore, when facing the nomadic people in the north, they are often at a disadvantage. Therefore, although the reasons for the demise of the Northern Song Dynasty and the Southern Song Dynasty are very similar, it is mainly because these rulers are very incompetent and have no strategic vision.

Therefore, many dynasties later learned the lessons of the Song Dynasty and attached importance to military development, because without strong military power, it was impossible to maintain a stable situation.