[5] In his dissertation, Richwine wrote that illegal Hispanic immigrants to America had lower IQs than non-Hispanic whites, and noted that this disparity persisted for several generations.
[7] Richwine subsequently wrote an article for Politico defending his dissertation and arguing that the statements it contained about ethnic differences in IQ were "scientifically unremarkable".
[9] In 2010, he wrote two pieces about immigration and crime for the online magazine AlternativeRight.com in response to a Ron Unz essay covering the same topic in The American Conservative.
The consequences are a lack of socioeconomic assimilation among low-IQ immigrant groups, more underclass behavior, less social trust, and an increase in the proportion of unskilled workers in the American labor market.
"[17]In a later work for The Heritage Foundation released in 2013, Richwine and co-author with Robert Rector wrote that the immigration reform bill then being weighed in the U.S. Senate would cost the government $5.3 trillion.
On May 6, 2013, Dylan Matthews wrote for The Washington Post that, "The study represents the most notable attack on the reform effort to date from a conservative group ...