Answer:
E.) None of these are untrue
Explanation:
All of the above statements contributed to the collapse of the U.S. economy in the 1930s.
The Soviet Union ( USSR) was communist( the Berlin Wall and a leader with total power)
The USA was/still democratic ( a government ran by the people).
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To defend off the invasions from northern invaders, Emperor Qin Shi Huang had all the walls joined up. Thus, the Great Wall came into being