Question: Scottsbluff is a city in Scotts Bluff county, that is part of what region of the United States that is covered in prairie, steppe, and grassland, and lies east of the Rocky Mountains?
Sentence (from "Scottsbluff, Nebraska"): Scottsbluff is a city in Scotts Bluff County, in the western part of the state of Nebraska, in the Great Plains region of the United States.
Relevant evidence: Yes