The Illegal immigrant population of the United States is estimated to be about 11 million people, down from a historic peak of 12.5 million people in 2007. According to a Pew Hispanic Center report, 57% of illegal immigrants are from Mexico, 24% are from other Latin American countries, primarily from Central America, 9% are from Asia, 6% are from Europe and Canada, and 4% are from the rest of the world
There are an estimated half million illegal entries into the United States each year. The unfenced, rural mountain and desert border between Arizona and Mexico has become a major entrance area for illegal immigration to the United States, due in part to the increased difficulty of crossing illegally into California.
A common means of border crossing is to hire professionals who smuggle illegal immigrants across the border for pay. Those operating on the US-Mexico border are known informally as "coyotes".
The tightening of border enforcement has disrupted an earlier pattern of back-and-forth movement of migrant workers from Mexico by increasing the costs and risks of crossing the border, thereby reducing their rate of return migration to Mexico. The difficulty and expense of the journey has prompted many migrant workers to stay in the United States longer or indefinitely. 
The US Department of Homeland Security and some advocacy groups have criticized programs of certain state and federal agencies in Mexico directed to Mexicans migrating to and residing in the United States. They claim that the assistance includes advice on how illegal immigrants may remain undetected in the United States, receive assistance from US government-run social services, enroll their children in public schools and send... [continues]
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(2010, 03). Illegal Mexican Immigration Into the Usa. StudyMode.com. Retrieved 03, 2010, from http://www.studymode.com/essays/Illegal-Mexican-Immigration-Into-The-Usa-298126.html
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