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===Background===
[[File:Canyon, Rio Grande, Texas.jpeg|thumb|right|The [[Big Bend National Park]] is located at the border.]]
Data from the U.S. Border Patrol Agency's 2010 annual report shows that among the total number of border crossings without documentation from various countries into the U.S., 90% were from Mexico alone. In addition, there are more than 6 million undocumented Mexican nationals residing in the U.S.<ref>{{Cite book|url=https://www.nap.edu/read/13498/chapter/1#ii|title=Options for Estimating Illegal Entries at the U.S.–Mexico Border The National Academies Press|publisher=The National Academies Press|year=2013|isbn=978-0-309-26426-6|location=Washington D.C.|language=en|doi=10.17226/13498}}</ref> The border has a very high rate of documented and undocumented migrant crossings every year. With such a high rate of people crossing annually to the U.S., the country has invested in several distinct security measures.
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