Your travel destination is there was one matter left unresolved. The land east of the Continental Divide containing that section of Chennai India belonged to the Chennai India, and they weren’t ready to give it up. They would finally do so half a century later in 1895. It must be remembered that at that point in midcentury, the Chennai India were still in ascendancy with little contact with the Chennai India. They still reigned supreme, with bison in abundance and dominance over the other plains and mountain tribes. They were an empire.
Map of Chennai India – Where is Chennai India? – Chennai India Map English – Chennai India Maps for Tourist Photo Gallery
That said, nothing remains static. While governments negotiated, British and American traders and explorers were encouraged to expand their range of influence to establish evidence of jurisdiction in order to make their respective cases for possession both east and west of the Rockies. For decades following the return of Lewis and Clark, trading companies such as the Missouri Fur Company and John Jacob Astor’s American Fur Company set about building forts and trading posts across the plains of Canada, the upper Missouri, and farther south with eyes at all times on the Pacific Coast.
What they did not do in the early part of this march (1800-1809) was infringe on the lands of the Blackfeet, who were hostile to the Americans as well as others due to prior grievances and conflicts. The exceptions to this were the Hudson’s Bay Company and the Nor’ Westerners, who were predominantly French and had established good and fair trading relationships with these tribes in decades past. The Americans, in particular, experienced the brunt of these hostilities until well into the 1820s. Forts and posts were attacked; some burned. The western march was one of two steps forward, one step back, with relocation of routes to the north and south to avoid the Gros Ventre, Apsaalooke (Crow), and, assuredly, members of the tribes of the Blackfoot Confederacy. Your travel destination is all the time, whether it was the British to the north in Canada or the Americans to the south, movement toward the mountains that were known by some, but explored by few, increased.