Get it straight from the government’s mouth.
http://www.uscis.gov/ilink/docView/SLB/HTML/SLB/0-0-0-1/0-0-0-29/0-0-0-8289.html
Mail this to everyone and post it every where.
I found the perfect reference to give to anyone who calls an illegal alien an “immigrant.”
http://www.uscis.gov/ilink/docView/SLB/HTML/SLB/0-0-0-1/0-0-0-29/0-0-0-101.html#0-0-0-585
It clearly explains what the definition of an immigrant is under subsection (15).
Throw that at every liberal who uses the word “immigrant” to describe illegals.