Montreal

MUCH as George W. Bush’s presidency was ineluctably shaped by Sept. 11, 2001, so the outbreak of the French Revolution was symbolized by the events of one fateful day, July 14, 1789. And though 18th-century France may seem impossibly distant to contemporary Americans, future historians examining Mr. Bush’s presidency within the longer sweep of political and intellectual history may find the French Revolution useful in understanding his curious brand of 21st- century conservatism.

Soon after the storming of the Bastille, pro-Revolutionary elements came together to form an association that would become known as the Jacobin Club, an umbrella group of politicians, journalists and citizens dedicated to advancing the principles of the Revolution.

The Jacobins shared a defining ideological feature. They divided the world between pro- and anti-Revolutionaries — the defenders of liberty versus its enemies. The French Revolution, as they understood it, was the great event that would determine whether liberty was to prevail on the planet or whether the world would fall back into tyranny and despotism.

The stakes could not be higher, and on these matters there could be no nuance or hesitation. One was either for the Revolution or for tyranny.