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Questioning the EU's Schengen Treaty

MIN READDec 6, 2012 | 00:53 GMT

French minister for European affairs Edith Cresson (C) is flanked by Luxemburg's G. Wohlfahrt (D) and Belgium's Keersmaeker (L) in Schengen, 1990.

(CHARLES CARATINI/AFP/Getty Images)

One of the pillars the European Union was built upon is coming under threat....

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