About: http://webisa.webdatacommons.org/420051703

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In that year, there were an estimated four million slaves living in the South and it is estimated that their aggregate market value was over $3 billion then.
http://www.w3.org/ns/prov#wasQuotedFrom	measuringworth.com