Question: The Bridger Trail, also known as the Bridger Road and Bridger Immigrant Road, was an overland route connecting the Oregon Trail to the gold fields of Montana, Gold was discovered in Virginia City, in 1863, Virginia City is a town in, and the county seat of which county in Montana, United States?
Sentence (from "Bridger Trail"): At the time the region was controlled by the Sioux, Cheyenne and Arapaho, who stepped up their raids in response to the stream of settlers along the trail.
Relevant evidence: No