What is the main cause of the Russian revolution?

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Tags

1. #russo
2. #bread
3. #returned
4. #revolution
5. #promised
6. #bolsheviks
7. #defeat
8. #peace
9. #japanese
10. #russia
11. #taking
12. #people
13. #sunday
14. #lenin
15. #after
16. #russian
17. #helped
18. #bloody
19. #exile
20. #german