Explain what you mean by that? The first income tax was on the top 1% of income earners and created in 1913. In the 60's and 70's, top tax rates of 60-70% weren't uncommon. The history of the income tax in America has always placed a heavier burden (some may argue much heavier burden) on the high-income earners.
And may I also add that history is just history, and things aren't automatically good or bad because we did them in the past. The country is pretty tolerant towards Wiccans given the historical context of the Salem Witch Trials, but that hardly means that we should re-institute witch burning just because it's the historical context.