The reason the Great Wall of China was built was because A. a series of invasions from the Mongols
B. A series of invasions from the Japanese
C. A series of invasions from the Russians

Which statement describes the primary purpose of the european union? question 1 options: to protect european nations in the event of another world war to work together to strengthen europe and benefit all member nations to prevent alliances from forming between member nations to share resources and make economic trade easier between coal and steel companies