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E-book World of Walls : The Structure, Roles and Effectiveness of Separation Barriers
In the past physical walls and fences surrounding territorial space, towns and villages were viewed by ancient nations from a defensive perspective, as a fortification to defend their territorial sovereignty and a rampart to protect themselves from the outside attacks. Dramatic changes in both military doctrine and technology in the last century led to a decline in the strategic and tactic importance of borders as a line of defense. Although one of the key aspects of the traditional notion of sovereignty was the right for states to control exclusively the movement of people across territorial boundaries and to expel undesirable aliens and immigrants, nowadays this authority has come into question not only because of increased globalization, but also because of great intellectual efforts to re-theorize the notion of the nation-state and its components, including the concepts of sovereignty and national borders.
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