Our 25th president loved tariffs, and oversaw an expansion of U.S. territory around the globe. But William McKinley is best remembered as being one of the four presidents that was assassinated.

William McKinley, the 25th U.S. president, is credited with using steep tariffs to protect the fledgling tinplate industry in the late 19th century. Did they work? Were they good for the U.S. economy?

President Trump has repeatedly expressed admiration for one predecessor in particular: William McKinley, our 25th president, who loved tariffs, and oversaw an expansion of U.S. territory around ...