Here is the best article I could find on the topic. If you have not read Piketty's book it is a good summary: http://scalar.usc.edu/works/growing-apart-a-poli

Here is the best article I could find on the topic. If you have not read Piketty's book it is a good summary: http://scalar.usc.edu/works/growing-apart-a-political-history-of-american-inequality/index http://scalar.usc.edu/works/growing-apart-a-political-histor...