How has the 1846 Treaty of Oregon stood the test of time?

The 1846 Treaty of Oregon settled the boundary between the United States and British North America along the 49th parallel, westward to the Strait of Georgia. That boundary remains in place today, so the correct choice is “The border at the forty-ninth parallel is the one we have today.” The 54°40′ line was an earlier U.S. expansion slogan, not the boundary established by the treaty.

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