After 1965, black civil rights leaders found it difficult to
a. now support hispanic rights in the united states.
b. achieve economic equality in the north.
c. protest the vietnam war.
d. enforce the new laws in the south.

Generally speaking, after 1965, black civil rights leaders found it difficult to "D. enforce the new laws in the South," since many local and state officials refused to do things like integrate school systems. 

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.