McKinley, a Civil War hero who preferred “The Major” above any other title he was given, changed the arc of American history by running the first truly modern presidential campaign. Knowing his party could only win if it grew beyond its base, he reached out to diverse ethnic groups, including openly seeking the endorsement of Catholic leaders and advocating for black voting rights. Running on the slogan “The People Against the Bosses,” McKinley also took on the machine men who dominated his own party. He deployed campaign tactics still used today, including targeting voters with the best available technology. Above all, he offered bold, controversial answers to the nation’s most pressing challenge—how to make a new, more global economy work for every American—and although this split his own party, he won the White House by sticking to his principles, defeating a charismatic champion of economic populism, William Jennings Bryan.