A) Slaves were transported to the Caribbean and the 13 Colonies from West Africa. b) Slaves was a major import to the New England Colonies because the region was primarily
agricultural and used slave labor.
c) Slaves were exchanged in West Africa for rum and weapons.
Which sentence did you find incorrect? How would you fix it?

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

to replace ineffective because   andrew jackson's spoil system was a deliberate policy after he became president to remove federal employees he considered to be political opponents and replace them with his own supporters.

c or d. good luck !