Question

Which was the last country to challenge the United States' control of Oregon?

Answer 1

The United States won Oregon in the War of 1812 against Great Britain. You can find more details about Oregon history here: http://www.ohs.org/education/oregonhistory/historicviewer/oregonboundary/index.cfm

I hope this helps!

Answer 2

Although Britian went on settling and establishing commercial interests (trading stations) in the Oregon territory well into the 1830s and 40s.

Answer 3

thank you to you both