“The proportion of the workforce that is foreign born” remained stable at about 6% between 1960 and 1980, but has since been soaring and was 13.2% in 2000. Pro-immigration people have argued that immigration is nothing new and that the United States has always had immigration. However, Roberts’ statistics show that the percent of immigrant workers more than doubled over a twenty year period.
Roberts also explains that the average immigrant has a lower wage than the average American. The obvious conclusion is that immigrants are lowering salaries in the U.S. for people who were born here because employers can turn to a substitute good, a foreign born employee willing to work for less money.