Why did Germany declare war on Soviet Union?

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Tags

1. #operation
2. #germans
3. #annihilate
4. #slave
5. #generalplan
6. #force
7. #could
8. #western
9. #labour
10. #caucasus
11. #soviet
12. #germany
13. #according
14. #effort
15. #ideological
16. #reserves
17. #stemmed
18. #acquire
19. #conquer
20. #union
21. #repopulated
22. #lebensraum
23. #slavs