The following graph of the biggest tax increases since 1950 is Kevin Drum's Treasury data graphed by Austin Frakt (via Ezra Klein):
If you're looking for something/anything superlative to say about the ACA, you could say it's the biggest tax increase of the entire millennium (!!!) or perhaps that it's the second-biggest tax increase signed by a Democrat since LBJ. As for the biggest tax acts in "history," health care reform barely cracks the top ten ... for the last 60 years.
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