George Bancroft,
The Presidents of the United States…
(1914)
“ The annexation of Texas having been accomplished, the Whigs now began to urge the Democrats to carry out their promise regarding Oregon, and, against the votes of the extreme southern Democrats, the president was directed to give the requisite twelve months notice. Further negotiations ensued, which resulted in the offer by Great Britain to yield her claim to the unoccupied territory between the 49th parallel and Columbia river, and acknowledged that parallel as the northern boundary. ”
