Center for Immigration Studies, Immigrants in the United States, 2007 – A Profile of America’s Foreign-Born Population, November 2007, Steven A. Camarota. “This Backgrounder provides a detailed picture of the number and socio-economic status of the nation’s immigrant or foreign-born population, both legal and illegal. The data was collected by the Census Bureau in March 2007. Among the report’s findings: The nation’s immigrant population (legal and illegal) reached a record of 37.9 million in 2007;Immigrants account for one in eight U.S. residents, the highest level in 80 years. In 1970 it was one in 21; in 1980 it was one in 16; and in 1990 it was one in 13…Since 2000, 10.3 million immigrants have arrived — the highest seven-year period of immigration in U.S. history. More than half of post-2000 arrivals (5.6 million) are estimated to be illegal aliens; The largest increases in immigrants were in California, Florida, Texas, New Jersey, Illinois, Arizona, Virginia, Maryland, Washington, Georgia, North Carolina, and Pennsylvania.”