Who did not share in the wealth of the growing nation?
a. those who did not in an industrial job.
b. all persons living in the southern states.
c. new immigrants.
d. enslaved african americans.

Generally speaking, it was "D. Enslaved African Americans" who not share in the wealth of the growing nation, since they were not paid at all--only given meager amounts of food and housing. 

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.