Final answer:
The yellow fever epidemic described in The American Plague was caused by mosquitoes and had devastating effects on Philadelphia in 1793.
Step-by-step explanation:
The yellow fever epidemic described in The American Plague was caused by mosquitoes.
The mosquitoes carried the yellow fever virus and spread it to humans through their bites. This led to a widespread outbreak of the disease.
The epidemic occurred in Philadelphia in 1793 and had devastating effects on the city's population, causing a significant number of deaths and forcing many people to flee.
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