As great as Jacob Hornberger is, I think his position is flawed. Hans Herman Hoppe, an equally superior libertarian philosopher, points this out: If libertarian philosophy was fully implemented in America, ALL property, including on the Borders, would be private property. Therefore, NO ONE could cross an American border without going into private property. So they would require an invitation from the property owner for the potential immigrant to cross into the owner’s property. Otherwise, they would be trespassing. Whatever penalties for trespassing in that area would apply. So Open Borders would be limited by the Common Law Private Property Laws in their area.