The Mongol invasion of China lasted over 6 decades and particularly involved the defeat of the Jin Dynasty, Western Xia

Western Xia

The Western Xia Dynasty or the Tangut Empire, was known to the Tanguts and the Tibetans as Minyak.The state existed from 1038 to 1227 AD in what are now the northwestern Chinese provinces of Ningxia, Gansu, eastern Qinghai, northern Shaanxi, northeastern Xinjiang, southwest Inner Mongolia, and...

, the Dali Kingdom, and the Southern Song, which finally fell in year 1276. The Mongols under Kublai Khan

Kublai Khan

Kublai Khan , born Kublai and also known by the temple name Shizu , was the fifth Great Khan of the Mongol Empire from 1260 to 1294 and the founder of the Yuan Dynasty in China...

 established the Yuan Dynasty

Yuan Dynasty

The Yuan Dynasty , or Great Yuan Empire was a ruling dynasty founded by the Mongol leader Kublai Khan, who ruled most of present-day China, all of modern Mongolia and its surrounding areas, lasting officially from 1271 to 1368. It is considered both as a division of the Mongol Empire and as an...

 in China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

 and crushed the last Song resistance in 1279, which marked the onset of all of China under the Yuan. This was the first time that whole China was ruled by a non-Chinese ruler.
At the time of the kurultai

Kurultai

Kurultai is a political and military council of ancient Mongol and Turkic chiefs and khans. The root of the word "Khural" means political "meeting" or "assembly" in the Mongolian language, it is also a verb for "to be established"...

, Genghis Khan

Genghis Khan

Genghis Khan , born Temujin and occasionally known by his temple name Taizu , was the founder and Great Khan of the Mongol Empire, which became the largest contiguous empire in history after his death....

 was involved in a dispute with Western Xia

Western Xia

The Western Xia Dynasty or the Tangut Empire, was known to the Tanguts and the Tibetans as Minyak.The state existed from 1038 to 1227 AD in what are now the northwestern Chinese provinces of Ningxia, Gansu, eastern Qinghai, northern Shaanxi, northeastern Xinjiang, southwest Inner Mongolia, and...

 — which eventually became the first of his wars of conquest.