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  1. Flag Timeline - US History

  2. List of flags of the United States - Wikipedia

  3. Betsy Ross flag - Wikipedia

  4. Timeline of the flag of the United States - Wikipedia

  5. U.S. Timeline 1770s - America's Best History

  6. Evolution of the American Flag - United States Flag

  7. Flag History & Evolution - National Flag Foundation

  8. The Mysterious Origins of the American Flag - HISTORY

  9. Facts about the United States Flag | Smithsonian Institution

  10. History of the American Flag | A Capitol Fourth - PBS