What latitude marks the majority of the border between Canada and the United States?

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The majority of the border between Canada and the United States is marked by the 49 degrees latitude line. This line stretches from the western boundary at the Pacific Ocean to the eastern edge near the Great Lakes, representing a significant portion of the border. This latitude was established in the Oregon Treaty of 1846, which settled disputes over the territories in the Pacific Northwest between the United States and Great Britain.

While the other latitude lines listed do exist, they do not represent the primary division between Canada and the United States. For example, 37 degrees latitude is several degrees south of the border, passing through states such as California and New Mexico. The 45 degrees latitude line runs through parts of the northern United States, but does not serve as a major border. Similarly, 52 degrees latitude is further north and not applicable to the border's main extent. Therefore, 49 degrees is the most accurate representation of the boundary between the two countries.