… is from chapter 2 of William Graham Sumner’s 1885 volume, Protectionism: the -ism Which Teaches that Waste Makes Wealth (original emphasis):
If, now, it was possible to devise a scheme of legislation which should, according to protectionist ideas, be just the right jacket of taxation to fit this country to-day, how long would it fit? Not a week. Here are 55 millions of people on 3½ million square miles of land. Every day new lines of communication are opened, new discoveries made, new inventions produced, new processes applied, and the consequence is that the industrial system is in constant flux and change. How, if a correct system of protective taxes was a practicable thing at any given moment, could Congress keep up with the changes and readaptations which would be required. The notion is preposterous, and it is a monstrous thing.