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  1. How has wealth distribution in the US changed over time?

  2. Bourgeoisie - Wikipedia

  3. Trends in U.S. income and wealth inequality | Pew Research Center

  4. How the American middle class has changed in the past five …

  5. Rise of Africa’s wealthy class drives change from within

  6. Differences Between Wealthy, Middle Class and Poor in the …

  7. What led to the rise of a wealthy middle class? - Answers

  8. The Rise of the Middle Class – HIS115 – US History Since 1870

  9. The emergence of the middle class: an emerging-country phenomenon

  10. The State of the American Middle Class - Pew Research Center