1. how did immigrants the us become the country
it is today?

Immigrants helped US to become what it is today by promoting and enhancing the culture and economy.

Explanation:

United States is the only country that has the highest number of immigrants. The largest immigrants entering into US are from Mexico. So, the main reason for US to have the maximum development as it has today is due to the diverse population. These immigrants help in promoting the ideas, culture, and trades to uplift the economic and result is the development we can see today.

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.