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For some 400 million Europeans the Schengen Treaty means they don’t need to pack a passport when travelling within the 26-nation Schengen Zone. That’s because the zone is free of internal border controls. For many, Schengen is considered the glue that keeps Europe together – but there are fears it is coming unstuck. On The Frontline explores the issue and looks at the future of passport-free travel within the Schengen Zone.
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