Discussions in the mid-1840s between the United States and the British government about the Oregon Territory border resulted in which of the following?
A. Britain signed over all land south of Alaska to the United States, as demanded by President Polk.
B. The border was drawn along the 49th parallel, where it had been before negotiations started.
C. The United States and Britain created a neutral zone around the Columbia River that was shared by both nations.
D. Britain threatened war if the United States attempted to claim more land, resulting in a border being drawn at the Columbia River.