Assertion: slave | /r/HasProperty | about four million slaves
Facets:
value: by 1860
type: TEMPORAL
value: in these states
type: LOCATION
Source sentences:
text: As a World Book article on the trade noted, by the early 1800s, more than 700,000 slaves lived in the southern United States, and by 1860, there were about four million slaves in these states.