What is the main cause of migration?

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Tags

1. #migration
2. #which
3. #reason
4. #natural
5. #opportunities
6. #except
7. #migrate
8. #flood
9. #disaster
10. #sometimes
11. #forced
12. #construction
13. #better
14. #employment
15. #causes
16. #education
17. #drought
18. #globalization
19. #villagers
20. #people
21. #common
22. #cities
23. #failure