What caused Berlin Wall to fall?

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Tags

1. #formally
2. #place
3. #resulted
4. #reunification
5. #ultimately
6. #revolutions
7. #nearby
8. #germany
9. #demise
10. #chain
11. #eastern
12. #hungary
13. #october
14. #particular
15. #berlin
16. #paved
17. #german
18. #countries
19. #poland
20. #series
21. #caused
22. #which
23. #reaction