Answer:
the United States and Great Britain
Step-by-step explanation:
The Oregon dispute was between the United States of America and the Great Britain.
The president of the US was Polk. The dispute was a territorial dispute. The US and Britain had territorial claims in the region.
Both nations signed a treaty in the year 1846. This treaty signified the end of their joint occupancy of the region.
The US got the Southern territory of the 49th parallel while the British got the north as well as vancouver island.