Why didn't Song Dynasty and Liao State get along? When did the feud end?

Because when the Song Dynasty was founded, Zhao Kuangyin once attacked the Northern Han Dynasty, which was a small country in five dynasties and ten countries, located in the north. Zhao Kuangyin's attempt to recover the Northern Han Dynasty and unify the Central Plains will threaten and affect the status of Liao, because the Northern Han Dynasty is a cooperative relationship with Liao, and the Northern Han Dynasty is a subordinate country of Liao.

Tracing back to the origin of the Song-Liao War, we have to talk about the friction between Zhao Kuangyin and Qidan during the Eastern Expedition in the Northern Han Dynasty. After several skirmishes, the two sides won and lost each other. In the fourth year of rejuvenating the country, Zhao Kuangyin called civil and military officials to discuss the strategy of attacking and destroying the Northern Han Dynasty. Although many courtiers opposed the crusade against the Northern Han Dynasty, the imperial court finally passed a resolution to crusade against the Northern Han Dynasty at the insistence of the main war faction.

This battle ended the 70-year-long chaos in the Five Dynasties and Ten Countries. This was the first large-scale war between Song Dynasty and Liao State, which ended in the defeat of Liao State. The relationship between Song Dynasty and Liao country also deteriorated sharply because of this battle. In the following hundreds of years, both sides were like enemies. Although the single-source alliance restored the country, with the rise of Jin Guo, the relationship between the two sides deteriorated again.

At that time, the Song and Liao countries were very big, but the core of political rule was riddled with holes and was very big, but not so powerful. Gold is just the right time for China. In order to strengthen centralization and prevent junior generals from being forced to "wear yellow robes", Zhao Kuangyin and Song Taizu rose up to usurp the new regime, and threatened and lured senior generals to hand over military power through banquets. As soon as I got up, I met the dying time of these two countries.

The dictatorships of Tong Guan and Cai Jing led to political corruption in the Song Dynasty, but the same thing happened in Liao. In the military agreement between Xu Jin and Guo Song, the Northern Song Dynasty thought that Liao could be easily defeated, so it sent troops to Yanjing, but it was defeated by the Liao army just calling from Xu Jin. Finally, Xu Jin sent troops from the military attache to capture Yanjing. According to the agreement at that time, sixteen states were owned by Song State after defeating Liao State, but after the demise of Liao State, Jin State refused to return sixteen states to Song State, because in the eyes of Jin people, the corruption and weakness of Song State had been exposed.