Antimonopoly and American Democracy traces the history of antimonopoly politics in the United States, arguing that organized action against concentrated economic power comprises an important American democratic tradition. While prevailing narratives tend to treat monopoly as a risk to people mainly in their roles as consumers--by causing prices to increase, for example--this study broadens the conversation, recounting ways in which monopolism can hurt ordinary people without directly impacting their wallets. From the pre-revolutionary era to the age of Big Tech, the volume explores the effects that historical monopolies have had on democracy by using their wealth and influence to dominate electoral politics and regulation. Chapters also highlight a range of sites of economic concentration, from land ownership to media reach, and attempts at combating them, from labor organizing to constitutional revision. Featuring original scholarship from some of the world's leading experts in American economic, political, and legal history, Antimonopoly and American Democracy offers important lessons for our contemporary political moment, in which fears of concentrated wealth and influence are again on the rise.