After the Qin Dynasty, the longest period of political fragmentation in Chinese history took placebetween the Han and Tang Dynasties, during the time when Buddhism first spread into China.between the Song and Yuan Dynasties, when the Mongols, led by Genghis Khan and eventually Khubilai Khan, kept invading China.between the collapse of the Tang Dynasty and the founding of the Song Dynasty.between the Qin and Han Dynasties, when Liu Bang was contending with rival warlords to reunite China after the collapse of the Qin.

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