What does all black American flag mean?

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Tags

1. #courage
2. #flags
3. #officer
4. #reminder
5. #represents
6. #officers
7. #designed
8. #inside
9. #background
10. #brother
11. #black
12. #fallen
13. #faced
14. #meaning
15. #sister
16. #these
17. #insurmountable
18. #constant