Steven Levitsky and Daniel Ziblatt, Harvard professors and authors of “How Democracies Die,” believe the polarization in the U.S. over issues involving race, religion, and culture could threaten democracy.

Steven Levitsky and Daniel Ziblatt, Harvard professors and authors of “How Democracies Die,” believe the polarization in the U.S. over issues involving race, religion, and culture could threaten democracy.