While its a short article from their site its informative , talking about how WW2 set the stage for where we are now with the income tax and how our government spending boomed since then with this new revenue stream https://taxfoundation.org/blog/world-war-ii-us-taxation/#%3A~%3Atext=WWII+Changed+How+We+Raise+Revenue&text=The+personal+income+tax+had%2Cas+a+share+of+revenue
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