Question: William Lewis Sublette exploited the riches along a wagon route that is how many miles long?
Sentence (from "William Sublette"): William Lewis Sublette also spelled Sublett (September 21 1798 - July 23 1845), was a pioneer, frontiersman, trapper, fur trader, explorer, and mountain man, who, with his four brothers, after 1823, became an agent of the Rocky Mountain Fur Company and later, one of its co-owners, exploiting the riches of the Oregon Country, which helped settle and improve the best routes, along the Oregon Trail.
Relevant evidence: Yes