"Lift Ev'ry Voice and Sing," written in 1900 in celebration of Lincoln's birthday by brothers James Weldon Johnson and J. Rosamond Johnson is considered the African National Anthem.
Source:
Timetables of African-American History (R 973.0496 Har) under "Negro National Anthem."
Notes:
The song can be found in "Reader's Digest Family Songbook of Faith and Joy" (R 782.25 Rea).