Why did some tribes of the Washington Territory agree to give up their ancestral lands in treaties? They believed the land had little value.

They realized the land on proposed reservations was better.

They wanted to encourage pioneers to settle in the region.

They wanted to maintain their traditional fishing rights.

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.

1. the spread of reform movements aimed at perfecting american society