At the end of the Eastern Han Dynasty, many heroes came together to fight for hegemony. First there were the Three Kingdoms, then the Two Jin Dynasties, and then came the Southern and Northern Dynasties when ethnic minorities took control of the Central Plains. The most powerful country in the Northern and Southern Dynasties, the Northern Wei Dynasty, unified the north for nearly a century and a half. As for the reason why the Northern Wei Dynasty was able to unify the north, besides having strong soldiers and strong horses, there is another reason...