What contributed to the beginning of the decline of the Roman Empire?
Choose all answer that are correct.

A: The soldiers hired on the frontiers were not willing to go defend other parts of the empire.

B: Incompetent rulers placed huge tax burdens on the Roman citizens.

C: Regardless of the strength of the emperors, the Roman army was unable to hold back barbarian invasions from the south and west.

D: Soldiers in the outer parts of the Roman Empire often supported local commanders instead of the emperor.

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.

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