The document discusses security along the US northern and southern borders. It notes that while the northern border with Canada is over 4,000 miles long, it has far fewer border patrol agents than the southern border with Mexico, which is about 2,000 miles long. It raises the question of why the northern border is not receiving as much attention from border security as the southern border, given its much greater length. It then examines security challenges along the US-Canada border in Montana in particular, considering whether this border poses a threat to national security.