| http://www.w3.org/ns/prov#value | - In Slavery's Borderland, historian Matthew Salafia shows how the river was both a physical boundary and a unifying economic and cultural force that muddied the distinction between southern and northern forms of labor and politics.Countering the tendency to emphasize differences between slave and free states, Salafia argues that these systems of labor were not so much separated by a river as much a
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