These six studies from the Walter Prescott Webb Memorial Lectures offer specific treatments of American antebellum expansionism. For Robert W. Johannsen of the University of Illinois at Urbana offers fresh insight into the meaning of the term “Manifest Destiny,” arguing for a broader definition. John M. Belohlavek of the University of South Florida takes a close look at the expansionist attitudes of Massachusetts politician, diplomat, reformer, and intellectual Caleb Cushing.