By Lynn ArditiPROVIDENCE, R.I. -- Billy Leiva grew up on American favorites such as Spider-Man and pizza, and dreamed of flying to outer space. He read history books; became the first president of his elementary school and, at Johnston High School, made the National Honor Roll. But he couldn't apply to college or land a job or even get a driver's license. He'd been living in the country illegally.