In 1644, the Manchus, a relatively unknown people inhabiting China's rude northeastern frontier, overthrew the Ming, Asia's mightiest rulers, and established the Qing dynasty, which endured to 1912. From this event arises one of Chinese history's great conundrums: How did a barely literate alien people manage to remain in power for nearly 300 years over a highly cultured population that was vastly superior in number? This problem has fascinated...