Question: Robert Crouch Kinney was a native of Illinois that crossed what 2170 mi historic east–west, large-wheeled wagon route and emigrant trail in the United States that connected the Missouri River to valleys in Oregon?
Sentence (from "West Brownsville, Pennsylvania"): Brownsville was the first point where the descent from the Appalachians could safely reach the river down the generally steep banks of the Monongahela River.
Relevant evidence: No