@darnell By the way, it is also more then a traderoute, if you look at that map, one thing you can see is that for the Maritime defense the northern coast of Alaska, the US is completely dependent on Canada. If Berings Strait would get blocked, the US has a real problem.
I am not saying this is an valid excuse for forcefully invading Greenland, .. I am just pointing out facts that most people probably miss if you just look at it on a normal map of the world.