The document provides background information on the Oregon Country region west of the Rocky Mountains. It describes the geography of the region, including fertile soil and forests that attracted fur traders seeking beaver and other animals. Mountain men engaged in the difficult and dangerous work of trapping. Four countries initially claimed the Oregon territory but the US and Britain eventually agreed to share it along the 49th parallel. The fur trade declined in the 1830s as animal populations decreased and fashion changed. Former trappers then guided settlers along routes to the West such as the Oregon Trail. Missionaries also came to the region to convert Native Americans to Christianity.