There is no surprise that America has gone through multiple revolutions, as the nations continues to battle political polarization. It is high time that we ought to understand how each major revolution taught the nation, especially the politicians something new and useful, regarding uniting the people altogether. Meanwhile, among some of the founding fathers, revolutions were interpreted differently.

Nathan Perl-Rosenthal is a professor of history at the University of Southern California. His writing has appeared in the Wall Street Journal, the Atlantic, the Nation, and the Los Angeles Times. The award-winning author of Citizen Sailors. He joins the latest show to talk about his new book "The Age of Revolutions."