Doggoner -
The major portion of the {BEAVER}Fur Trapping (1800 - 1840s (?) era occurred in NW (primarily what is now US- WA,OR,ID,MT,WY,(+ the w, coast of AK) & Can. - BC, AB, & SK (southern part )
The Major players were the Fur Companies & the 2 who were Dominate = The NORTH WEST CO. (NWC) & The HUDSON BAY CO> (HBC) the in July 1821 the NWC became a part of the HBC !!! {recommend the Book -- The Great Northwest Fur Trade (an easy read & LOTs of Pics & info.
BTW - I am a "Co. Man" { the NWC, HBC, + the short lived PFC (Astor's Pacific Fur Co.) were headed by SCOTs )
Feel free to PM me if you have ??