Social Sciences
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Geography- People that migrate illegally to the U.S. from Mexico and Central American countries have to cross harsh desert-like terrain to get to the U.S.
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Sociology- Many people from different countries believe that the U.S. will bring them to a better life full of opportunity. That often turn out to not be true as it is hard to succeed if you are not a legal citizen.
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Political Science- Some people leave their countries because the form of government that is in place in their country doesn't follow what they believe in.