Previous U.S. administrations had offered to divide the region along the 49th parallel, which was not acceptable to Britain, as it had commercial interests along the Columbia River.[129] Britain's preferred partition was unacceptable to Polk, as it would have awarded Puget Sound and all lands north of the Columbia River to Britain, and Britain was unwilling to accept the 49th parallel extended to the Pacific, as it meant the entire opening to Puget Sound would be in American hands, isolating its settlements along the Fraser River.[129]
Edward Everett, Tyler's minister in London, had informally proposed dividing the territory at the 49th parallel with the strategic Vancouver Island granted to the British, thus allowing an opening to the Pacific. But when the new British minister in Washington, Richard Pakenham arrived in 1844 prepared to follow up, he found that many Americans desired the entire territory.[130] Oregon had not been a major issue in the 1844 election. However, the heavy influx of settlers, mostly American, to the Oregon Country in 1845, and the rising spirit of expansionism in the United States as Texas and Oregon seized the public's eye, made a treaty with Britain more urgent.