How did a drop in population affect the roman empire?
a. it led to the abolition of slavery.
b. it led to advancements in the medical field.
c. it weakened the roman economy and military.
d. it weakened support for the roman republic.

One of the ways in which a drop in population affected the Roman Empire was that "It weakened the Roman economy and military," since there were less people involved in both the economy and the military. 

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