How did Chinggis Khan conquer the Xi Xia state in the Qinghai region?

Chinggis (Genghis) Khan did not conquer the Xi (Western) Xia state in a single event; rather, the process spanned over two decades of military campaigns and diplomatic maneuvering.12

He began his initial campaign against the Tangut state in 1205. By 1209, he successfully secured the allegiance of the Xi Xia, effectively neutralizing them as a potential enemy to ensure his rear was protected before launching major invasions into the Jin state of northern China.234

Despite this earlier submission, the final conquest of the Xi Xia was not completed until 1227. Genghis Khan prioritized dealing with the wealthy Tangut state before committing his main forces to the full conquest of China. He led the final, successful campaign against the region in 1227, the same year in which he died. Following this victory, the territory—which included parts of modern-day Qinghai, Gansu, Ningxia, and Shaanxi—was incorporated into the expanding Mongol Empire.52134