From the 1810s until the 1840s, modern-day Washington, Oregon, Idaho, and western Montana, along with most of British Columbia, were part of what the United States called the Oregon Country and Britain called the Columbia District.
Fra 1810’erne indtil 1840’erne udgjorde de moderne amerikanske stater Washington, Oregon, Idaho, og det vestlige Montana, sammen med størsteparten af British Columbia det område amerikanerne kaldte Oregon Country og briterne for Columbia District.