4. USA
Of course, the well-known famous US-Mexico border, which is, apart from being probably one of the most famous, also the one of the most militarizes, heavily guarded and secure borders in the world. In order to have the better control over this huge (3,201 miles long) border, US has special patrol – United States Border Patrol (USBP) whose task is to prevent illegal border crossings as well as all other illegal actions (weapon smuggling, human trafficking, etc.).
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