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  1. Income tax - Wikipedia

  2. Income tax | Definition, Types, & Facts | Britannica Money

  3. What Is Income Tax and How Are Different Types Calculated? - Investopedia

  4. Income tax in the United States - Wikipedia

  5. Legal history of income tax in the United States - Wikipedia

  6. The Purpose and History of Income Taxes | St. Louis Fed

  7. The History and Evolution of Income Tax in the United States