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.
柏林写道： 除了种植园本身以外，国内贩奴贸易成为南方最大的产业，並可能是在使用现代交通工具、金融、宣传上最先进的。