May. 27, 2005
The report, "The New Era of Migrations," indicates that the Mexican-born U.S. population grew from 879,000 in 1970 to about 10 million in 2000.
The average length of stays by those Mexicans increased from 5.5 months in the period 1993-1997, to 12.2 months between 2001 and 2003.
Only a fifth of the Mexican-born migrants gained U.S. citizenship.
"Undocumented migration of Mexicans (to the United States) became the predominate modality," said Elena Zuniga, head of the population council.