Why was ww2 the deadliest war in human history?

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Tags

1. #money
2. #conflict
3. #changes
4. #reaching
5. #other
6. #children
7. #property
8. #destructive
9. #people
10. #holocaust
11. #world
12. #million
13. #killed
14. #during
15. #history
16. #damaged
17. #estimated
18. #caused