The rise and influence of public opinion on Chinese foreign policy reveals a remarkable evolution in authoritarian responses to social turmoil. James Reilly shows how Chinese leaders have responded to popular demands for political participation with a sophisticated strategy of tolerance, responsiveness, persuasion, and repression -- a successful approach that helps explain how and why the Communist Party continues to rule China. Through a detailed examination of China's relations with Japan from 1980 to 2010, Reilly reveals the populist origins of a wave of anti-Japanese public mobilization that swept across China in the early 2000s. Popular protests, sensationalist media content, and emotional public opinion combined to impede diplomatic negotiations, interrupt economic cooperation, spur belligerent rhetoric, and reshape public debates. Facing a mounting domestic and diplomatic crisis, Chinese leaders responded with a remarkable reversal, curtailing protests and cooling public anger toward Japan.