… is from chapter 5 of William Graham Sumner’s superb 1885 book, Protectionism: the -ism Which Teaches that Waste Makes Wealth (original emphasis):
Protectionism is now corrupting our political institutions just as slavery used to do, viz., it allies itself with every other abuse which comes up.
DBx: Indeed – and one such prominent other abuse that has been threatened in recent days is the abuse of monetary policy to paper over the damage wreaked by Trump’s tariffs.