What is Assassin's Creed Black Flag based on?

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Tags

1. #action
2. #published
3. #modern
4. #sequences
5. #developed
6. #black
7. #montreal
8. #video
9. #major
10. #succeed
11. #adventure
12. #precedes
13. #assassin
14. #creed
15. #historical
16. #sixth
17. #ubisoft
18. #though
19. #series
20. #timeframe
21. #installment