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> Well, whether you agree with it or not, part of the justification is that if anybody can cross easily, terrorist groups will, too. You don't hear a lot about

• commandlinefan 7y ago
  That might be because it’s way bigger than the wall we would need on the southern border or because more people cross from the south than from the north or because they actually are using border security as an excuse to keep out Mexicans - but keeping terrorists out is (one of) the justifications for classifying border security as a national security and therefore military issue.
• stale2002 7y ago
  > You don't hear a lot about the big wall we need across the Canadian border. We don't have many people crossing the border illegally, at the canadian border. Of course we are going to prioritize the location in which the vast majority of people who enter the border illegally, are using. Which is the southern border, in this case.