In 1923 Harding paid tax on his 1922/23 presidential salary, having in 1921 effectively killed a proposed bill that would make presidents permanently immune from income tax. Income tax was established in the 1913 Sixteenth Amendment.
In 1963, US President Johnson imposed a 25 % tax (almost 10 times the average) on potato starch, dextrin, brandy, and light trucks, resulting in VW vans and pickups disappearing from the U.S. market. Why?
Who was the first US president to succeed to the Presidency upon the assassination of his predecessor and the first US President to be impeached?