Why did North Korea invaded South Korea?

Related questions

1. Does North Korea have nuclear power plants?
2. Is it safe to travel to Seoul?
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6. Can British citizens visit North Korea?
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Tags

1. #communist
2. #november
3. #korea
4. #north
5. #attack
6. #united
7. #joined
8. #china
9. #american
10. #states
11. #against
12. #force
13. #chinese
14. #nations
15. #composed
16. #unleashing
17. #dozen
18. #ground
19. #south
20. #massive
21. #invaded
22. #countries
23. #forces