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.
Michael Tadman menulis di Speculators and Slaves: Masters, Traders, and Slaves in the Old South (1989) bahwa 60–70% transmigrasi merupakan hasil dari penjualan budak.