Michael Tadman wrote in Speculators and Slaves: Masters, Traders, and Slaves in the Old South (1989) that 60–70% of inter-regional migrations were the result of the sale of slaves.
迈克·特德曼在《旁观者和奴隶们：老南方的主子、贩子和奴隶》（1989）中写道约有60–70%的跨地区移民是由于贩奴造成的。