Where did the term Happy Birthday come from?

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Tags

1. #origins
2. #stories
3. #later
4. #songbook
5. #kindergarten
6. #least
7. #birthday
8. #years
9. #sisters
10. #mildred
11. #happy
12. #morning
13. #class
14. #published
15. #their
16. #patty
17. #century
18. #introduced
19. #kentucky