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A March 2000 Census Bureau survey showed that Mexico accounted for more than a quarter of all foreign-born residents of the United States, the largest share that any country has contributed since 1890, when about 30 percent of the country's foreign-born population was from Germany.

A March 2000 Census Bureau survey showed that Mexico accounted for more than a quarter of all foreign-born residents of the United States, which makes it the largest share for any country to contribute since 1890, when about 30 percent of the country's foreign-born population was from Germany.