First Trip Along the Platte River

In order to reach the interior West, the last untouched fur country in the United States, William Ashley had revolutionized the trade when the Arikaras and Blackfeet forced him away from the Missouri. His successors — we are concerned with the Rocky Mountain Fur Company, who trapped fur, and Sublette & Campbell, who supplied them — retained the methods he had pioneered. They used land transportation, taking out goods and bringing back furs by pack train up the valley of the Platte River and through South Pass.