Describe the immigration trend between 1900 and 1940? What factors contributed this trend?​

Immigration in the Early 1900s. After the depression of the 1890s, immigration jumped from a low of 3.5 million in that decade to a high of 9 million in the first decade of the new century. Immigrants from Northern and Western Europe continued coming as they had for three centuries, but in decreasing numbers.

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.