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'''Illegal aliens''' are people who immigrate into a country without having proper documentation or approval by the country in question.

'''Illegal aliens''' are people who immigrate into a country without having proper documentation or approval by the country in question. Illegal aliens either cross the border illegally or overstay their visas.

In the United States, illegal aliens cross the border illegally or overstay their visas.

Although Mexican nationals make up the majority of recent illegal aliens, a great number of illegal aliens are also Canadian, Australian, or British Citizens.

Although Mexican nationals make up the majority of recent illegal aliens, a great number of illegal aliens are also Canadian, Australian, or British Citizens.