“chain kept moving, and Ball led the file down through Virginia into North Carolina at a steady pace. As the days wore on, the men, who were never out of the chains, grew dirtier and dirtier. Lice hopped from scalp to scalp at night. Black-and-red lines of scabs bordered the manacles. No matter: The Georgia-man would let the people clean themselves before they got to market. In the meantime, the men were the propellant for the coffle-chain, which was more than a tool, more than mere metal. It was a machine. Its iron links and bands forced the black people inside them to do exactly what entrepreneurial enslavers, and investors far distant from slavery’s frontier, needed them to do in order to turn a $300 Maryland or Virginia purchase into a $600 Georgia sale.”