Generalise: Oz (etc.) has no borders (with other countries), but people still enter illegally.
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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 either cross the border illegally or overstay their visas.
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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 either enter the country illegally or overstay their visas.
Mexican nationals make up the majority of recent illegal aliens in the United States.
Mexican nationals make up the majority of recent illegal aliens in the United States.