Why did the chinese rebuild the great wall of china in the 1400's

Explain how social darwinism impact imperialism.

Which of the following could be described as a conservative reaction against the ideas of the jazz age

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countires in an effort to build a stronger team. after learning this, the secondteam begins its own recruitment campaign to find better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rivals most recent addition. which idea from the cold war is most similar to this scenario