US Income Tax Rates

I've looked at this chart in the past, and think its pretty amazing.  It shows the highest tax rates in the late1930s to the early 1980s, and the gradual drop in the tax rate when Reagan came to office.  The income tax rate got to as low as 28% by the end of his term.  Today, we are back to around 40%, and the subject remains a major sticking point in politics.  At least its not 91%!