Assertion: burro's horse | /r/HasSubevent | near-elimination of mustangs
Facets:
value: in that area
type: LOCATION
value: by 1860
type: TEMPORAL
Source sentences:
text: When the area was ceded to the U.S. in 1848, these horses and others in the surrounding areas were rounded up and trailed north and east, resulting in the near-elimination of mustangs in that area by 1860.