Which of the following were changes america experienced during the second half of the nineteenth century? more then one answer
a. a war with great britain
b. major technological advances
c. an agricultural revolution
d. changes in education
e. the industrial revolution

Second half of the nineteenth century = 1850 - 1900

b. major technological advances
e. the industrial revolution

During this time period, people developed new technologies, one of the most impactful being steam power. They used elements to create stronger metals and new raw materials to manufacture different goods. Factories grew and the very beginning of mass producing emerged.

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.