Answer:
Under the Sui Dynasty China enter the golden age.
Step-by-step explanation:
The Sui Dynasty was a short imperial dynasty, they unified the Northern and Southern dynasties. The emperors improve the agricultural system for better productivity. They spread Buddhism throughout the empire. By the middle of the age, the empire entered a golden age of prosperity with fast population growth.
They also created the Grand Canal but unlike the topic of the question, it linked the east with the west and the northern border.
I hope this answer helps you.