What is the definition of “memoir”?
a fictional work that is read by a large number of people
a nonfictional work that is popular with children and adults
a narrative that recounts personal experience and development
a poem that describes the conflict between a character and society

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

the answer is typhoon