About: http://webisa.webdatacommons.org/456553863

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	And remember that prior to the 18th century, slavery was a system that had been ubiquitous on every continent.
http://www.w3.org/ns/prov#wasQuotedFrom	independent.org