Why is it important to Black Africans, that proof is found that Black Africans built Great Zimbabwe and the cities along the eastern coast of Africa and not "whites" or Arabs?

Which answer best describes the u. s. national road? it ran from atlanta to baltimore and followed the railroad. it ran from new york to chicago and was made from wooden planks. it ran from massachusetts to ohio and ran parallel to the canal system. it ran from maryland to illinois and was made using macadam construction.