What happened to Russian, Spanish, and British claims to the Oregon Country?

The Oregon Country was originally claimed by Great Britain, France, Russia, and Spain; the Spanish claim was later taken up by the United States.Spain later relinquished any remaining claims to territory north of the 42nd parallel to the United States as part of the Adams-Onís Treaty of 1819.

The Oregon Country was originally claimed by Great Britain, France, Russia, and Spain; the Spanish claim was later taken up by the United States. ... Spain later relinquished any remaining claims to territory north of the 42nd parallel to the United States as part of the Adams-Onís Treaty of 1819.

They grew domesticated plants.They grew Cassava in huge quantity.