The only evidence I have is anecdotal unfortunately- Mostly West African muslim who were versed in quarnic arabic. There's not as far as a know a precise figure on how many African slaves were literate on coming to america.
Also depends on whether you consider the use of talking drums as a form of literacy, which in my opinion is a VERY underrated technological innovation on the part of many SSAs societies.
Or the use of basic symbols and mathematical formulas in Ifa divination system of the Yoruba.
^^^^But, then again Yoruba weren't as well represented in the US as compared to the Caribbean and South America.
It kind of depends on how expansive of a definition you want use to denote 'literacy'.
Also depends on whether you consider the use of talking drums as a form of literacy, which in my opinion is a VERY underrated technological innovation on the part of many SSAs societies.
Or the use of basic symbols and mathematical formulas in Ifa divination system of the Yoruba.
^^^^But, then again Yoruba weren't as well represented in the US as compared to the Caribbean and South America.
It kind of depends on how expansive of a definition you want use to denote 'literacy'.