Why is Ireland not in Schengen?

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Tags

1. #travel
2. #ended
3. #ireland
4. #common
5. #agreement
6. #schengen
7. #impose
8. #addition
9. #between
10. #frontier
11. #where
12. #persons
13. #because
14. #interest
15. #would
16. #entry
17. #britain
18. #travelling
19. #controls
20. #situation