Answer: Jesus Christ
Explanation: He is the reason why there is a religion called Christianity. Without Jesus, there wouldn't be a Christian movement.
In fact, Christian was the name given to all who were followers of Christ's teachings. The movement then grew to become Christianity that we know today.
The Berlin Wall literally divided the East and the West of Germany, while the West side of Germany adopted Capitalism, the East side was ruled by Socialism. The Berlin Wall was heavily secured so people could not move from one side to the other and during the Cold War, it also was a sign of the silent conflict between the United States (West Side) and the Soviet Union (East Side).
Improvements in technology definitely changed how people worked. Jobs in factories just became easier, for example, industrial lubrication helped machines run smoothly which made their job easier and the process faster.
It changed how people lived, too. Purchasing clothing and goods costed less because of the technology.