How would american politicians modify their policies in order to support the era of good feelings?

Well, a large way would definitely be that, you know, not railing on against the British and how dumb & stupid they were? Maybe even speaking about befriending them and opening up to foreign powers for trade, diplomacy, etc. All that jazz.

Ithink it’s c , good luck on whatever : )

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.