Why did the first world war start?

Related questions

1. Who Won First World War?
2. Who Declared War on who in ww1?
3. Why did Germany take all the blame for WWI?
4. What caused ww1 to start?
5. What started ww1 summary?
6. Who won War of the Worlds?
7. What caused World War One?
8. Could World War 1 been avoided?
9. Was ww1 avoidable?
10. Why is Austria Hungary to blame for ww1?

Tags

1. #simply
2. #event
3. #began
4. #world
5. #gavrilo
6. #however
7. #triggered
8. #august
9. #first
10. #princip
11. #directly
12. #declarations
13. #causes
14. #austrian
15. #trigger
16. #assassination
17. #franz
18. #ferdinand
19. #bosnian
20. #revolutionary
21. #archduke