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  1. Taxation in the United States - Wikipedia

  2. Infographic: How the U.S. Tax System Works - The Peter G.

  3. Tools | Internal Revenue Service - IRS tax forms

  4. Taxes Definition: Types, Who Pays, and Why - Investopedia

  5. US Tax Data Explorer | Taxes in the United States

  6. What the right to a fair and just tax system means for taxpayers

  7. How taxes work (article) | What are taxes? | Khan Academy

  8. America’s Progressive Tax and Transfer System: Federal, State, …

  9. How America's progressive tax system works - Business Insider