Who assisted in creating Pierre L’Enfant’s plan for Washington, D.

Pierre L’Enfant’s 1791 plan for Washington, D.C., was assisted by Benjamin Banneker, a free African-American surveyor, mathematician, and astronomer who helped survey the city’s boundaries. The APA’sAICP Certification Exam Content Outline(2022), under “Fundamental Planning Knowledge,” notes, “Benjamin Banneker assisted L’Enfant by surveying the land for Washington, D.C.’s layout.” Frederick Douglass (B), Robert Robinson Taylor (C), and Booker T. Washington (D) were notable figures but lived later and were not involved in the plan—Douglass (1818–1895) was an abolitionist, Taylor (1868–1942) an architect, and Washington (1856–1915) an educator. TheCPC Study Manual(2024) confirms, “Banneker’s surveying worksupported L’Enfant’s plan for Washington, D.C.,” supporting option A.