It appears that the present-day form of African American English is not the inheritance of the period of slavery, but the creation of the second half of the 20th century.
“While it is well enough to leave footprints on the sands of time, it is even more important to make sure they point in a commendable direction.”
“We can always find something to be thankful for, and there may be reasons why we ought to be thankful for even those dispensations which appear dark and frowning.”