Why did the united states get pulled into world war i? a. the united states was shown a letter from germany encouraging mexico to invade america. b. mexico attacked the united states. c. germany owed the united states money for war supplies.

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

yes

explanation: