In the relatively short history of the United States, certain events irrevocably altered the direction of the nation and signaled the dramatic start of a new historical reality. Some took the form of groundbreaking political and philosophical concepts; some were dramatic military victories and defeats. What all of these turning points had in common is that they forever changed the character of America.

Edward O’Donnell is a professor of history at College of the Holy Cross. He is the author of several books, including Henry George and the Crisis of Inequality: Progress and Poverty in the Gilded Age. O’Donnell also has curated several major museum exhibits on American history and appeared in several historical documentaries.

See omnystudio.com/listener for privacy information.