David A. Bell is the Lapidus professor in the department of history at Princeton and the author, most recently, of Men on Horseback: The Power of Charisma in the Age of Revolution.
A new book by Ruth Ben-Ghiat discusses the past and present challenges posed by authoritarianism, but misses the social and economic conditions in which it arises.
To understand the American and French revolutions, one must look not simply at their origins in the wider world but also at how particular environments could become crucibles of intense and rapid political change.