Genghis khan had a strict military discipline and demanded absolute loyalty, although he was strict he would reward one for bravely, him doing this they conquered the Asians steppe land and went towards China and subdued only northern China
Kublai Khan (his grandson) now ruled the empire calling it yuan dynasty, they still had the European connection to Asia but a Italian traveler named Marco polo visited, in his book he wrote a review about his experience in yuan dynasty saying how beautiful every thing was. 100 years later Europe read it and took interest in china.
r Kublai Khan died the yuan dynasty declined. There was natural disasters, major corruptions in the government,Confucian scholars retreated into their own world. Then Zhu Yuanzhang (peasant leader) created a rebel army and pushed the mongols back to the Great Wall. Then Zhu Yuanzhang name the new Chinese dynasty Ming.