This income data is from an academic paper “Income Inequality in the United States, 1913-1998” by Saez and Piketty. It is the longest history that I have found so far and it focuses on high-income “tax units”, i.e. IRS income data of the wealthy.
The U-shape of this graph was a little startling as was the dramatic drop in income during World War II.

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This advice is really going to help, thanks.