From an undated William Jennings Bryan campaign print, “Shall the People Rule?” Library of Congress.

“Never in the history of the world was society in so terrific flux as it is right now,” Jack London wrote in Iron Heel, his 1908 dystopian novel in which a corporate oligarchy comes to rule the United States. He wrote, “The swift changes in our industrial system are causing equally swift changes in our religious, political, and social structures. An unseen and fearful revolution is taking place in the fiber and structure of society. One can only dimly feel these things, but they are in the air, now, today.”

The many problems associated with the Gilded Age—the rise of unprecedented fortunes and unprecedented poverty, controversies over imperialism, urban squalor, a near-war between capital and labor, loosening social mores, unsanitary food production, the onrush of foreign immigration, environmental destruction, and the outbreak of political radicalism—confronted Americans. Terrible forces seemed out of control and the nation seemed imperiled. Farmers and workers had been waging political war against capitalists and political conservatives for decades, but then, slowly, toward the end of the nineteenth century a new generation of middle class Americans interjected themselves into public life and advocated new reforms to tame the runaway world of the Gilded Age.

Widespread dissatisfaction with new trends in American society spurred the Progressive Era, named for the various “progressive” movements that attracted various constituencies around various reforms. Americans had many different ideas about how the country’s development should be managed and whose interests required the greatest protection. Reformers sought to clean up politics, black Americans continued their long struggle for civil rights, women demanded the vote with greater intensity while also demanding a more equal role in society at large, and workers demanded higher wages, safer workplaces and the union recognition that would guarantee these rights. Whatever their goals, “reform” became the word of the age, and the sum of their efforts, whatever their ultimate impact or original intentions, gave the era its name.