Question

Which nations claimed the Oregon country? How did John Quincy Adams resolve the claims?

Answer 1

There were several nations who sought to claim the territory such Americans, British, French and Spanish.  John Quincy Adams resolved this through the Treaty of 1818 where the boarder of the United States and Canada was established at the 49th Parallel.  

Answer 2

The Oregon Country was a disputed region of the Pacific Northwest of North America. The area now forms part of the Canadian province of British Columbia, and the American states of Oregon, Washington, Idaho and parts of Montana and Wyoming.

The region was, at various times, disputed by Great Britain, Spain, Russia and America.

John Quincy Adams created the joint occupation that divided the Orange Country evenly between Great Britain and America at the 49 degrees latitude.