In 1860, how far west could a person travel by rail from new york? only as far as chicago only as far as the mississippi river only as far as the missouri river all the way to the west coast

In general, in 1860 a person could travel to the west coast by rail, although it should be noted that the route was highly contentious and dangerous along some spots.

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.