What caused collapse of Soviet Union?

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Tags

1. #europe
2. #dropped
3. #began
4. #dramatically
5. #resigned
6. #leader
7. #gorbachev
8. #reforms
9. #eastern
10. #revenue
11. #union
12. #meanwhile
13. #collapse
14. #december
15. #soviet
16. #hasten
17. #fruit