The story of benjamin banneker, who to complete the construction of washington, d. c. because he memorized the original design plans, illustrates the fact that a. all african-americans were not slaves at this time in american history. b. george washington’s family member received the job of designing washington, d. c. c. george washington’s friend received the job of designing washington, d. c. d. constructing washington, d. c. was a difficult job.