What were the nations that claimed the oregon country?

the nations that claim the oregon country were france, spain, great britian,and russia. 

The Oregon Country was originally claimed by Great Britain,France, Russia, and Spain; the Spanish claim was later taken up by the United States. The extent of the region being claimed was vague at first, evolving over decades into the specific borders specified in the US-British treaty of 1818.

4.a depression is the answer