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Plague is an infectious disease caused by bacteria called Yersinia pestis. These bacteria are found mainly in rodents, particularly rats, and in the fleas that feed on them. Other animals and humans usually contract the bacteria from rodent or flea bites.
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When the last Chinese dynasty—the Qing dynasty —fell in 1911–1912, it marked the end of the nation's incredibly long imperial history. That history stretched back at least as far as 221 BCE when Qin Shi Huangdi first united China into a single empire. During much of that time, China was the single, undisputed superpower in East Asia, with neighboring lands such as Korea, Vietnam, and an often-reluctant Japan trailing in its cultural wake. After more than 2,000 years, though, Chinese imperial power under the last Chinese dynasty was about to collapse for good.
