What is the importance of the Forks of the Road memorial in the book, The Deepest South of All?

Grant visits the Forks of the Road memorial early on in his Natchez visit. This memorial site was the second-largest slave market in the Deep South. After this visit, Grant begins to realize that the sorrow of slavery pervades the entire town. Without the dedication of Ser Boxley, even this small memorial would be lost to time.