I believe that it was the U.S army
The answer is right there. The great leap led to economic failure failures and this affected the people because they were food shortages in the country.
Answer:
Because he was a hunter-gatherer
Explanation:
For hunting and gathering we need to move here and there in search of food.
Due to moving here and there for long time, now we are able to run or walk .
Trenches sheltered troops from atrillery and machine gun and rifle gire from across no mans land