How did World War I affect the economy of the United States? A
It helped the country become the strongest industrial power in the world.
B
It hurt the economy because the government regulated industry.
С
Many men could not find jobs when they returned from the war.
D
It was a good time for farmers, but there was little effect on manufacturing.

Economic Impact on the United States. World War I took the United States out of a recession into a 44-month economic boom. ... U.S. exports to Europe increased as those countries geared up for war. Later, U.S. spending increased as it prepared to enter the war itself.Explanation:

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

answer; /// i believe that the correct answer is (d)the huang he river valley;