What was one reason that immigrants came to america in the late eighteen hundreds

One good reason was because America, at the time, was at it's golden age. Everything was new, business was prospering, and people were working their way up the ladder. Whereas, in other countries the  economies seemed to be getting worse, or there was famine, which prompted many people to sail to America in search of jobs, and a better life for their family.

Many came to join family that were already in America, others came because there were many oppertunities here.  

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.