About: http://webisa.webdatacommons.org/423804365

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	By the 1830s, many Southerners had shifted from, Slavery is a necessary evil, to Slavery is a positive good.
http://www.w3.org/ns/prov#wasQuotedFrom	historynet.com