Prior to American possession it was jointly claimed by Britain, Russia, Spain and the United States. By 1844, when Polk ran for President, Britain was the main contender . Of course, there were Indians living there as well. Nobody really owns land. You may be able to get a deed for a piece of land, but your deed is good only so long as the government that issued it holds power.
It was owned by the Indians, but controlled by the Spaniards.
The Oregon territory was gained by the UNITED STATES of AMERICA from Britain. The Oregon territory was fairly large, which enabled the US to gain more resources and have more land for settlement. THESE FACTORS ARE THE EFFECTS OF THE ACQUISITION OF THE OREGON TERRITORY
Northwest Territory
Oregon Countrythe Oregon Countrythe Oregon Country
Britain
The Oregon Territory became part of the United States in the 1840's just before the Civil War. The discovery of the Oregon Trail led to many wagon trains and settlers going to Oregon Territory.
Oregon
Oregon
Russia, Spain and Great Britain also had claims on the oregon territory
No, the last territory acquired by the United States was not the Oregon Territory. The Oregon Territory was acquired in 1846 through a treaty with Great Britain. The final addition to U.S. territory was the purchase of Alaska from Russia in 1867.
1846
Britain