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How has wealth distribution in the US changed over time?
Bourgeoisie - Wikipedia
Trends in U.S. income and wealth inequality | Pew Research Center
How the American middle class has changed in the past five …
Rise of Africa’s wealthy class drives change from within
Differences Between Wealthy, Middle Class and Poor in the …
What led to the rise of a wealthy middle class? - Answers
The Rise of the Middle Class – HIS115 – US History Since 1870
The emergence of the middle class: an emerging-country phenomenon
The State of the American Middle Class - Pew Research Center