There are a lot of state programs that allow people to access benefits, whether they're legal residents or not. Many illegals steal identities so they can work and receive welfare and housing subsidies, or they work under the table (thus paying no taxes). I'm not saying that most DACA's do this, but since they have no social security number, I'm not sure how they can work legally in the U.S.  In any case, the U.S. spends many billions of dollars a year educating the children of illegal immigrants. And btw, the illegals are not just 'Mexicans', they're from central America and many other places.