Assertion: sweet potato | /r/HasProperty | established as food plants
Facets:
value: by the time
type: TEMPORAL
value: well
type: OTHER
value: in south and central america
type: LOCATION
Source sentences:
text: Evidence shows the crop being cultivated by native South Americans for at least 5,000 years, and by the time Christopher Columbus arrived in the New World in the late 15th century, Sweet potatoes were well established as food plants in South and Central America.