Why did John Philip Sousa write Stars and Stripes Forever?

Related questions

1. What instruments did John Philip Sousa invent?
2. Where did John Philip Sousa work?
3. Why was Stars and Stripes Forever written?
4. Where did John Philip Sousa go to college?
5. Who owns the Washington Post and Amazon?
6. What music did John Philip Sousa write?
7. Is The Washington Post Pro Republican?

Tags

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2. #writing
3. #america
4. #surprise
5. #nicknamed
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11. #1890s
12. #music
13. #forever
14. #stars
15. #wrote
16. #loved
17. #popular
18. #march
19. #philip
20. #playing
21. #classic