The US-Canadian border along the 49th parallel is the longest national border in the world at 5,525 miles. You’d think such a long border would be fairly invisible, especially since it runs through forests for much of its length. But there’s a straight line running through those woods in which a 20-foot-wide swath of trees have been cut down.
In fact, they call it the Slash. It’s visible in satellite photos.Stripped of trees, this…
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