Has the US ever had a flat tax?

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1. #times
2. #enacted
3. #common
4. #another
5. #before
6. #however
7. #major
8. #america
9. #government
10. #income
11. #these
12. #twice
13. #share
14. #above
15. #taxes
16. #federal
17. #history
18. #imposed
19. #crisis
20. #first