Why are the Sooners called Sooners?

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Tags

1. #settlement
2. #benjamin
3. #proclaimed
4. #lands
5. #state
6. #official
7. #settlers
8. #unassigned
9. #given
10. #entered
11. #april
12. #officially
13. #start
14. #sooners
15. #before
16. #president
17. #oklahoma
18. #harrison