Assertion: migratory grasshopper | /r/CapableOf | destroy many prairie farms
Facets:
value: in canada
type: LOCATION
value: in the 1870s
type: TEMPORAL
value: in the united states
type: LOCATION
Source sentences:
text: The Rocky Mountain locust and the migratory grasshopper (Melanoplus spretus and M. sanguinipes, respectively) destroyed many prairie farms in Canada and the United States in the 1870s.