Robert Tracy McKenzie examines how ideas about human nature have shaped American democratic thought, tracing debates from the Constitutional Convention through Tocqueville's observations to the present. McKenzie, a historian at Wheaton College, argues that the Founders designed institutions premised on human fallenness--the belief that people, especially people with power, would abuse it unless checked. This 'tragic' view of human nature contrasted with the more optimistic assumptions of later democratic theorists who trusted popular virtue. The book explores how Tocqueville, visiting America in the 1830s, analyzed democracy's strengths and weaknesses in terms that remain relevant: the tyranny of majority opinion, the loss of traditional sources of authority, the restless striving that democracy encourages. McKenzie writes from an explicitly Christian perspective, finding in Tocqueville's analysis resources for understanding contemporary polarization and the erosion of democratic norms. He argues that recovering a sober view of human limitations might help Americans resist both cynicism and naivete about political life. The book addresses general readers interested in history and politics, not requiring specialized knowledge but rewarding careful attention. McKenzie models engaged scholarship that brings historical perspective to bear on present concerns without collapsing the distance between past and present.