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Economic pressures and chaos with the Mexican government forced thousands of Mexicans to leave their country and enter the US.
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Congress passed an act establishing a US border patrol in order to secure the borders between inspection stations.
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At this time smuggling of Mexicans across the border was an easy process, as much of the southern boundary is unguarded and the Rio Grande could be easily crossed.
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This special program allowed migrant people to work on US farms and railroads.
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The Mexican government insisted in renewing the program but the US government was not interested. Undocumented laborers continued to arrive from Mexico without papers or proof of citizenship.
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Half of these illegal immigrants were from Mexico.
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Requires a person to provide proof of citizenship to register to vote and identification to vote.
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Between 2000-2007 the number of undocumented immigrants increased by 3.3 million
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This law requires all aliens over the age of 14 who are in the US longer than 30 days to have registration documents in their possessions at all times.
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The number of undocumented immigrants decreased by 1.7%.
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Federal immigration law does not bar Arizona from suspending or revoking the licenses of businesses that employ unauthorized aliens.
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Judge Susan Bolton made immigration enforcement the responsibility of the federal government and not the states. She also blocked the section that immigrants have to carry documents proving their citizenship on them at all times.
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The Department of Homeland Security will no longer initiate the deportation of illegal immigrants who came to the United States before age 16, have lived here for at least five years, and are in school, are high school graduates or are military veterans in good standing. The immigrants must also be under 30 and have clean criminal records.
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The Supreme Court delivered a decision on Arizona's tough 2010 immigration law, upholding its most hotly debated provision but blocking others because they interfered with the federal government's role in keeping the immigration policy their responsibility.
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Obama's plan would let some 4.4 million remain in the country temporarily, without the threat of deportation as long as they are parents of U.S. citizens and legal permanent residents