A troubling statistical ploy for two reasons. Accuracy in the impacted regions and the misleading nature of the statistic. Following are more relevant facts and statistics.
In California, approximately 40% of the public schools are populated by children with Hispanic surnames. In rural, central California those numbers are near 85%. After March 2003, more than 50% of the newborns in California had Hispanic surnames as opposed to approximately 15% before WWII.
Approximately 85% of California's residents with Hispanics surnames are the result of illegal immigration since WWII. The state's percentage of residents with Hispanic surnames stayed relatively constant (15%) from the turn of the century until the advent of the Bracero Program in the 1960's. The initial inflow of unregulated Mexicans into California that followed the Bracero Program, came not from California's border with Mexico, but from migration through Texas.
My children have Hispanic surnames, they go to public schools, but they're native-born citizens. I would venture to say that at least 95% of the kids in their school with Hispanic surnames are natural born US citizens.
So I don't have the slightest problem accepting that statistic.
Remember, most illegals don't enter the country with kids, they have them here.
Those kids, under the current accepted interpretation of the Fourteenth Amendment are NOT illegal aliens.