What was a main tool used by the united farm workers in the 1960s to raise awareness about the plight of migrant farm workers? boycotts taking over federal buildings violent protests preservation of cultural areas

The main tool used by the United Farm Workers in the 1960s was "boycotts" since this was the most tangible and effective way that they could bring about change in a peaceful manner. 

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.

They weaken the south vietnamese army.