His Mom's fault
The boy's 18 and never had a birth certificate, and never asked his mother about it? He was applying to colleges and his mom never mentioned it?
And his mom is Mexican, but he's never been there. Surely, he would have asked about meeting his grandparents in Mexico at some point in his life?
The movie makes out the US government is the problem. The real problem and blame is his mother. She didn't even teach him Spanish.