How did the tang dynasty reunited china

After nearly four centuries of internal divisions and strife, China was reunited under the leadership of Yang Jian. A member of a respected aristocratic family, Yang Jian founded the Sui Dynasty. Yang Jian used Buddhism to help unite the kingdom.

The Tang Dynasty reunited China by establishing an efficient and well trained bureacracy.

Explanation:

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HAN DYNASTY WAS THE LONGEST REIGNING IMPERIAL DYNASTY OF CHINA

FIRST KNOWN PAPER-MAKING PROCESS WAS INVENTED BY CAI LUN OF HAN DYNASTY

THE FAMOUS SILK ROAD WAS ESTABLISHED DURING THEIR REIGN

Summed up the Han made scientific advancements such as the invention of paper, use of water clocks and sundials to measure time, and development of a seismograph