War and taxes.
Lincoln imposed the first income tax to pay for the Civil War.
Ironically, President Taft's Sixteenth Amendment was followed by WW1. But not so ironic when you know President Taft was a war-monger who supported revolutionaries against Russia's Christian monarchy. In his famous April 1917 WW1 speech to congress President Wilson praised those revolutionaries who had just destroyed Russia's 900 year old monarchy and called them America's "partner."
Not sure how this current GOP tax plan might figure into another war... but there has been a lot of war-mongering during Trump's presidency.