The number of migrants coming to the United States each year, legally and illegally, grew very rapidly starting in the mid-1990s, hit a peak at the end of the decade, and then declined substantially after 2001.
The Hispanic population is growing faster in much of the South than anywhere else in the United States.
Hispanics accounted for half of the population growth in the United States between the elections of 2000 and 2004 but only one-tenth of the increase in the total votes cast.
Most of the unauthorized population lives in families, a quarter has at least some college education and illegal workers can be found in many sectors of the US economy.
The undocumented population of the US now numbers nearly 11 million people, including more than 6 million Mexicans according to new estimates based on the most recent official data available.
Most Mexican migrants want to remain in this country indefinitely but would participate in a temporary worker program that granted them legal status for a time and eventually required them to return to Mexico.