In 2006, the U.S. Customs and Boarder Protection Agency apprehended about 1.1 million aliens at our southern border; the overwhelming majority was from:

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The overwhelming majority of aliens apprehended at the U.S. southern border in 2006 were from Mexico. This is due to Mexico's direct border with the United States, making it the most common nationality among those attempting to cross into the U.S. from the south.