Preventing the rise of Genghis Khan

May 2009
That responsibility would've fallen more to the Jin dynasty which controlled northern China at the time. They might've been able to check the Mongols' rise by maintaining a strong presence in Mongolia like the previous dynasty (the Liao) had, but ultimately I don't think there was much they could've done because the late 12th/early 13th century was just a very bad time for the Jin. For one thing the Yellow River flooded causing great devastation in several areas of Jin territory. At around the same time the network of vassal tribes and mercenary armies that the Jin used to defend the steppe frontier started to fall apart. The Tatars and Onggirats, two important Jin allies, rebelled in quick succession. In Mongolia Toghrul Khan, another important Jin vassal, was deposed and driven from power. And in inner Mongolia the defenders of that region, the Onggut Turks, were taken over by a usurper king that the Jin didn't trust. While the Jin were building more walls and looking for new tribal allies a new war with the Sung erupted in 1206, the same year Genghis Khan was crowned. The Jin were in a weak position and Genghis Khan knew it. It was Jin defectors in his own ranks that urged him to invade. By then there was not much the Jin could've done. Luck just wasnt on their side.

The Sung did eventually make contact with the Mongols. The two groups had a common enemy in the Jin and when the Mongols reached out to the Sung for a meeting in 1221 a Sung envoy named Zhao Hong was sent to Beijing to meet with the Mongol ruler of the region, Muqali (he never got to meet Genghis himself. He was campaigning in Persia at the time). Zhao Hong's description of the Mongols (The Mengda Beilu) is the earliest written account of the Mongol empire. A decade later the Sung allied with the Mongols to finish off the last remnant of the Jin, but in victory the Sung attempted to occupy Henan, which got them chased off by the Mongols. The relationship gradually started to sour after that.
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Ad Honorem
Dec 2015
In the ideal situation, Jin could have made peace with Xia and Song; then, this was almost impossible.
Another possible policies: (Time traveling webnovels often feature such policies)
Destroy the Mongolian leading classes and send the rest of these people to the Song Dynasty. Jin themselves faced a hostile native population.

The issue for Jin was: how to maintain the military prowess while adopting the Han cultural practices. Its military prowess declined rather rapidly after entering the Chinese heartland.
Apr 2018
Los Angeles
If Temujin was never born, another steppe leader most likely would have united the tribes. For centuries, the steppe nomads were busy killing each other until they realized that they can simply band together and obliterate everyone around them as a unified force.

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