A common argument that is used both in favor and against immigration is the economic impact of immigration. Through research I have found that while it is near impossible to definitively state whether immigrants in large quantities are helpful or harmful the united states economy, their effect in either direction does not have a substantial impact in most aspects of the economy. While there are significant differences in first generation immigrants and native residents their overall impact does not have significant effect on the average American. Arguably the most important is on population. Immigration in recent years has reached levels of the early 1900's except now most immigrants are from Asia and Latin america instead of Europe. According a US census survey, growth in american prime working age individuals is mostly contributed by immigrants having a ~ 2% growth in prime age immigrants with native citizens losing prime age population at ~ -0.5% growth. I was unable to find s