Fur traders entered the area in the first half of the 19th century, coming from Canada and from Astoria on the Columbia River. One of the earliest was Alexander Ross of the North West Company, who crossed the range in the summer of 1814, probably via Cascade Pass. The period of uncertainty surrounding the disputed Oregon Country gave way following partition along the 49th Parallel to a period of tentative U.S. Army exploration in tandem with violent subjugation of Indian tribes on the American side of the frontier in the second half of the century. With the partition, the Hudson's Bay Company was forced to seek an alternative to its older Brigade Trail via the Okanogan River and the construction of a new route over the northern spine of the Canadian Cascades from the area of Spuzzum into the valley of the Coldwater River to connect fort Langley on the lower Fraser with its northern posts in New Caledonia. The route was impracticable and was soon abandoned, though more southerly routes through what is now Manning Park laid the foundations for later routes such as the Dewdney Trail and the modern Crowsnest Highway via Allison Pass, and was later similar to a route via the Coquihalla Pass for its southern mainline. South of the boundary, reconnaissance for possible railroad routes (none of which were viable north of the one eventually put in over Stevens Pass, at the southern edge of the North Cascades) and various mining rushes.