8. Smuggling of immigrants
Annual revenue: $6.7 billion
With so many wars going on in the world, it seems this trade will never come to an end. Of course, people may be unfortunate enough to wish to move to another country for some other reasons, but escaping war-affected areas is one of the main motives. Illegal immigration takes place along two major routes. The first one leads from Latin to North America, while the second is running from East, North and West Africa to Europe. Approximately 3 million people from Latin America illegally enter the US every year.
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