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  1. The Progressive Era | Key Facts | Britannica

  2. Progressive Era - Wikipedia

  3. The Progressive Era (Progressive movement) (article) | Khan Academy

  4. The Progressive Era 1890s - 1920s - American History

  5. Progressive Era to New Era, 1900-1929 - Library of Congress

  6. United States - Reforms, Immigration, Industrialization

  7. The Progressive Era | Timeline | Britannica

  8. Progressive Era - UH - Digital History

  9. Progressive Era - Social Welfare History Project

  10. Progressive Era | Encyclopedia.com

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