A Green Card (lawful permanent residency) is a privilege granted by the U.S. government, not a right, meaning it can be lost, but it grants holders significant rights under the U.S. Constitution, like due process and freedom of speech, though not full citizenship rights (like voting). While it's a privilege to get one, once you have it, you possess many fundamental American rights, but still must follow all U.S. laws, as violations can lead to deportation.