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 for any country to contribute since 1890, when about 30 percent of the country's foreign-born population was from Germany.

• Athe largest share for any country to contribute  
• Bthe largest share that any country has contributed  
• Cwhich makes it the largest share for any country to contribute  
• Dhaving the largest share to be contributed by any country  
• Ehaving the largest share to have been contributed by any country