Pew Hispanic Center - Fact Sheet - May 22, 2006
Modes of Entry for the Unauthorized Migrant Population
http://pewhispanic.org/files/factsheets/19.pdf
"Nearly half of all unauthorized migrants how living in the United
States entered the country legally through a port of entry such
as an airport or a border crossing point where they were subject
to inspection by immigration officials...."[read on]
Reagan's amnisty program went into effect in 1986 [20 years ago].
Six million divided by 20 years = 300,000 per year. Not a small
number, but not significant enough to spend billions in building a
300+ mile fence. Doesn't pass the cost/benefit test.