With the signing of the Oregon Treaty in 1846, the United States agreed to establish its northern border with western British North America along the 49th parallel. By 1857, Americans and British were beginning to respond to rumours of gold in the Fraser River area. Almost overnight, some ten to twenty thousand men moved into the region around present-day Yale, British Columbia, sparking the Fraser Canyon Gold Rush. Governor James Douglas was suddenly faced with having to exert British authority over a largely alien population. In order to normalize its jurisdiction, and undercut any Hudsons's Bay Company claims to the resource wealth of the mainland, the Crown colony of British Columbia was established August 2, 1858. In 1866, it was united with the Colony of Vancouver Island into the United Colonies of Vancouver Island and British Columbia.