The United States laws do not discriminate against immigrants. In fact, you can ask anyone who wins the diversity lottery. There are only a few ways to become a legit US citizen, but hundreds of ways to immigrate to the country and live as though you were a legit green cardholder. Thousands of foreign visitors take immigration laws by their hands. In my old neighborhood, in fact, there was a lawyer who offered services to anyone wants to own a green card by increasing the clients' odds to win the diversity lottery. No kidding.
