Before revision: Sub-Saharan societies are generally termed oral rather than literate civilisations, owing to their use of oral tradition even when a writing system has historically been accessed or developed; the tradition of the Ghana Empire likely contains information thousands of years old.
After revision: Sub-Saharan societies are generally termed oral rather than literate civilisations, owing to their use of oral tradition even when a writing system has historically been accessed or developed; the tradition of Wagadufor instance likely contains information thousands of years old.