USA HISTORY

Detailed explanation-1: -Originally Spain, Great Britain, Russia, and the United States claimed the territory. In 1819, under terms of the Transcontinental Treaty, Spain ceded its claims to the territory to the United States.

Detailed explanation-2: -The United States and Great Britain signed the Treaty of Oregon on June 15, 1846, ending 28 years of joint occupancy of the Pacific Northwest. The treaty established the 49th parallel as the border between the two countries.

Detailed explanation-3: -The treaty was negotiated by Secretary of State James Buchanan, who would become the nation’s 15th president, and Sir Richard Pakenham, the British minister to the United States.

Detailed explanation-4: -This area was called the Oregon Territory by the Americans and the Columbia region by the British. The Convention of 1818 resolved some territorial disputes stemming from the War of 1812 and earlier, and resulted in an agreement for both nations to jointly occupy and administer the territory for a period of 10 years.

Detailed explanation-5: -Two years earlier, the United States and Great Britain had signed the Oregon Border Treaty which guaranteed the US claims to the lands incorporated in the Oregon Territory.