Mr. Pahlavi is the most prominent Iranian opposition figure and, increasingly, a unifying symbol among Iranians who seek to replace the current regime with a secular liberal democracy. He is uniquely positioned, therefore, to shed light on Iran at the crossroads. Can it manage the unprecedented series of historic challenges that it faces? How will it seek to break out of the corner into which President Trump has maneuvered it? And what strategy should the United States adopt to achieve the best results for itself and the Iranian people?