

The National Archives and Records Administration presents a web page full of links for genealogical research: http://www.nara.gov/genealogy/genindex.html
The publication "Communique", http://www.ins.usdoj.gov/graphics/publicaffairs/communique/index.html, by the Immigration and Naturalization Service.
Chinese Immigration and Chinese in the United States, a publication by the National Archives and Records Administration: www.nara.gov/regional/findaids/chirip.html
The U.S. Department of States's Background Notes for Mexico: http://198.252.9.108/govper/backgroundnotes/[mexico_0849.pdf]
The Canada-United States Relations site: can-am.gc.ca/menu-e.asp
Genealogical research links: www.genealogylinks.net/usa
United States Immigration Law: http://www.lawguru.com/ilawlib/04.htm
Human Rights Watch World Report: United States: http://www.hrw.org/reports98/us-immig
Diversity and United States Immigration: http://www.prb.org/pt/2001/July2001/us_diversity.html
A helpful listing of research links by the University of Colorado: http://www-libraries.colorado.edu/ps/gov/us/immigration.htm
University of Michigan's list of Immigration statistical sources: http://www.lib.umich.edu/govdocs/stats.html