Which of these was a major factor in the outcome of the mexican american war in the mid-1800s? a) the mexican army was using superior weaponry. b) the united states troops were greatly outnumbered. c) the united states was fighting a defensive war in their homeland. d) the mexican army was plagued by political instability in their government.

The answer is d, because the U.S. was fighting an offensive war as Texas had yet to be annexed 

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.