Assertion: prairie dog | /r/AtLocation | the united states
Facets:
value: west of the mississippi river
type: LOCATION
value: primarily
type: DEGREE
Source sentences:
text: Prairie dogs are found in the United States, Canada, and Mexico.
text: In the United States, prairie dogs are primarily found west of the Mississippi River, but they have been introduced into a few eastern locales.
text: They are native to the continent of North America and can be found in the United States, Canada and Mexico.