The authors main claim in Text I is that...

A higher standards of living in the US have attracted more immigrants from neighboring countries. B American salaries have risen because of the lowskilled immigrants that have left the US. C the increase of immigrant population in the USA has benefitted the economy and created more job opportunities. D the additional influx of immigrant workers and professionals had a positive impact on the educational standards of Americans. E more businesses and high-technology enterprises take advantage of undereducated workers moving into the US.