changend enabled the abolition of boarder between signatory states and the creation of a single external border where border checks on entry this chingin arir carried
Schengen enabled the abolition of internal border checks between signatory states and the creation of a single external border where border checks on entry to the Schengen area are carried out.
Schengen enabled the abolition of border between signatory states and the creation of a single external border where border checks on entry the Schengen area are carried