The Nations that had claim in Oregon was Great Britain and the United States.
Robert Gray
Great Britain
Monroe Doctrine
Russia Spain Great Britain United States
The Louisiana Purchase was the basis of the US claim and England's claim was based on the voyage of James Cook in search of the Northwest Passage and the activities of the Hudson Bay Company in the Oregon Country. The Treaty of 1818 provided for joint occupation and settlement as well as other issues. Instead of Fifty-four Forty or Fight the two nations settled their dispute with the 1846 Oregon Treaty.
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The states formed from the Oregon Country are primarily Oregon and Washington. California was not part of the Oregon Country; it was part of the territory acquired through the Treaty of Guadalupe Hidalgo in 1848, following the Mexican-American War. The Oregon Country, which included present-day Oregon, Washington, and parts of Idaho and Montana, was jointly occupied by the U.S. and Britain until the Oregon Treaty of 1846 established the U.S. claim.
No they gave England a claim to Oregon
The Spanish officially relinquished their claim to Oregon through the Adams-Onís Treaty, which was signed in 1819 and ratified in 1821. This treaty defined the boundaries between the United States and Spanish territories, with Spain ceding its claims to the Pacific Northwest, including Oregon, to the U.S. The agreement was part of a broader resolution of territorial disputes between the two nations.
Robert Gray established the first U.S. claim in Oregon.