How was europe able to practice imperialism?

When the Europeans set up colonies, they could use their colonies as military bases. This would help the European countries spread their influence around the world. It also would help increase their power since they controlled land and people around the world. There were a few other reasons for European imperialism.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

b. andrew