Answer:
Great Britain
Explanation:
In the 1840s the United States wanted the area of the Oregon Country for itself, the problem was that Britain also occupied the area. Both countries started to negotiate on the issue and agreed that the border should follow the 49th parallel except Vancouver Island that should belong to Britain.
In the 1840s, the United States had a dispute over the Oregon Country with Great Britain. Thus, the correct option is B). Great Britain.
Oregon boundary dispute was a territorial dispute over the political division of the Pacific Northwest of North America in 19th-century. The major conflict was arise between the United States and the Great Britain along with several nations.
The United States made a proposal to extend the Oregon border along the same parallel to the Pacific Ocean, but Great Britain proposed that the northern border should be drawn west to the Columbia River and then follow that river to the ocean.
Then, The Oregon Treaty was signed between the American and British in order to brought an end to the Oregon boundary dispute. It can be concluded that the United States had a dispute over the Oregon Country with Great Britain.
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