Sui

1.The Sui attacked Korea four times, and each time they were defeated. Khan of the eastern Turks then surronded the empire and they attacked the Sui.
 * Failures of the Sui Dynasty:**

2.The Sui started from 581 and ended in 618, the Sui Dynasty lasted for only 38 years and had only three emperors.

3.Independent governments a rose when the Sui Dynasty was coming to an end. Then China was split into smaller states.

4.Emperor Yang was a tyrant.His reputation towards the people was negative.

5. Yang was strangled by one of his assistance's.This caused the Sui Dynasty to officially collapse.

6. Yang spent a lot of money treating his people cruely.