Berlin wrote: The internal slave trade became the largest enterprise in the South outside the plantation itself, and probably the most advanced in its employment of modern transportation, finance, and publicity.
Berlin menulis: "Perdagangan budak dalam negeri menjadi perniagaan terbesar di Selatan di luar perkebunan itu sendiri, dan mungkinlah yang paling canggih dalam penggunaan transportasi modern, keuangan dan publisitas.