Why does British English use s instead of z?

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Tags

1. #british
2. #english
3. #world
4. #commonly
5. #either
6. #thing
7. #things
8. #version
9. #acceptable
10. #codified
11. #become
12. #began
13. #ending
14. #struggle
15. #first
16. #started
17. #verbs