3. El Salvador
Undocumented population: 704,000
Surprisingly, illegal immigrants belonging to El Salvador, one of the countries where most of the illegal immigrants came from actually decreased in between 1990-2000. However, they have since increased by over 200%, and this increase shows no sign of abating, mainly due to the belief that the current gang war in the country could turn into a national civil war, which would be destructive for El Salvador. The rate of El Salvadorians entering the US is so high, that ten people from El Salvador are held at the border for every Mexican held, and currently, more people from El Salvador face deportation trials than any other nationality.
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