On this map, the line of 49 degrees north latitude follows a national border.
How does the map show the national border?
At a close look at the map, we can see that the national Canada is seen to appear in pink while the American continent is the nation that appears in green.
When we look approximately at 49 degrees, we can see that their is the presence of the thick line that helps to separate the two nations from each other. This line is what is called the national border.
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