Why are Spanish question marks upside down?

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Tags

1. #proper
2. #these
3. #marks
4. #spanish
5. #because
6. #allows
7. #upcoming
8. #question
9. #reader
10. #punctuation
11. #following
12. #exclamation
13. #upside
14. #simply
15. #inverted
16. #statement
17. #believe
18. #point