Answer:
foreign imperialism
rise of industry and commerce
development of an intellectual class
Explanation:
In the ancient times, the urban centers of China started growing along the banks of the river Yellow along its middle and lower courses in the northern China.
Ancient China had seen the growing emergence of large cities during the early 20th century. One of the cause of this emergence is the foreign imperialism. Most of the western countries have shown interest in capturing China because they wants to capture the market over China.
This was due to the rise in trading and commerce in China. Industry and commerce began to rise in China in the early 20th century. People started manufacturing metals and weapons in that period. They also trade spices, silk, agricultural products and many more items. And as a result there was the development of an intellectual class of people in China.
All these factors have lead to the emergence of large cities during the early 20th centuries in China.