The document discusses Mexican immigration to the United States from 1990 to 2007. It notes that the Mexican immigrant population grew from 4.2 million in 1990 to over 11.6 million in 2007, accounting for 31.1% of all US immigrants. Attempts to stem immigration through laws like IRCA failed to curb the influx. This led to increased anti-immigration sentiment, particularly directed at Mexicans. In response, Mexican-American communities mobilized politically throughout the country to demand more rights for immigrants in the face of restrictive legislation.