2. Guatemala
Undocumented population: 704,000
As mentioned earlier, Central American countries dominate this list, and Guatemala, which has the second highest American population from Central American countries, also has one of the highest illegal populations in the country. Most of the Guatemalans in the country arrived decades ago when civil war broke out in their home country, which forced many people to flee in order to protect themselves and their families. Since the country itself does not share a border with the US, it enters through the Mexican-US border, after first entering Mexico through the notoriously susceptible Mexico-Guatemala border.
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