Agreed that any country that may be claimed by either party on the northwest coast of America westward of the Stony Mountains shall, together with its harbors, bays, and creeks, and the navigation of all rivers within the same, be free and open for the term of ten years from the date of the signature of the present convention to the vessels, citizens, and subjects of the two powers; it being well understood that this agreement is not to be construed to the prejudice of any claim which either of the two high contracting parties may have to any part of the said country, nor shall it be taken to affect the claims of any other power or state to any part of the said country, the only object of the high contracting parties in that respect being to prevent disputes and differences amongst themselves. The negotiation of 1824 was productive of no result, and the convention of 1818 was left unchanged. The negotiation of 1826, having also failed to effect an adjustment by compromise, resulted in the convention of August 6, 1827, by which it was agreed to continue in force for an indefinite period the provisions of the third article of the convention of the 20th of October, 1818; and it was further provided that-- It shall be competent, however, to either of the contracting parties, in case either should think fit, at any time after the 20th of October, 1828, on giving due notice of twelve months to the other contracting party, to annul and abrogate this convention; and it shall in such case be accordingly entirely annulled and abrogated after the expiration of the said term of notice. In these attempts to adjust the controversy the parallel of the forty-ninth degree of north latitude had been offered by the United States to Great Britain, and in those of 1818 and 1826, with a further concession of the free navigation of the Columbia River south of that latitude. The parallel of the forty-ninth degree from the Rocky Mountains to its intersection with the northeasternmost branch of the Columbia, and thence down the channel of that river to the sea, had been offered by Great Britain, with an addition of a small detached territory north of the Columbia. Each of these propositions had been rejected by the parties respectively. In October, 1843, the envoy extraordinary and minister plenipotentiary of the United States in London was authorized to make a similar offer to those made in 1818 and 1826. Thus stood the question when the negotiation was shortly afterwards transferred to Washington, and on the 23d of August, 1844, was formally opened under the direction of my immediate predecessor. Like all the previous negotiations, it was based upon principles of "compromise," and the avowed purpose of the parties was "to treat of the respective claims of the two countries to the Oregon Territory with the view to establish a permanent boundary between them westward of the Rocky Mountains to the Pacific Ocean."