Document your assertion, the way I documented mine.The tax system is not nearly as progressive as it was during the 1950's. back then the top tax rate never got below 84.36%, and was sometimes as high as 92%.
The high top tax rate isn't what makes it progressive.
What percentage of the taxes were paid by the top 20%? By the top 1%?
They pay a much larger portion now than they did then.