premise: Silver Bow County is a county in the State of Montana. As of the 2010 census, the population was 34,200. Its county seat is Butte. In 1977, the city and county governments consolidated to form the single entity of Butte-Silver Bow. Additionally, the town of Walkerville is a separate municipality from Butte and is within the county.
hypothesis: Silver Bow County borders South Dakota.
reason: It is not known if Silver Bow County borders a state.