Final answer:
Yellow fever epidemics in Memphis occurred during the late 19th century, specifically in 1878 and 1879.
Step-by-step explanation:
Yellow fever epidemics happened in Memphis during the late 19th century. Memphis experienced waves of yellow fever outbreaks in 1878 and 1879, resulting in the loss of over ten thousand lives.
The epidemics were part of a larger pattern of yellow fever outbreaks in urban centers during that time, caused by poor sanitation and crowded living conditions.