As a citizen, you have a relationship to an artificial construct, the constitution, to which you swear your loyalty. It is a rational relationship and, ultimately, an elective relationship. Try as one might, one can never stop being an American. One can, as a matter of choice, stop being a citizen of the United States. Similarly, one can elect to become a citizen of the United States. That does not, in the fullest sense of the word, make you an American. Citizenship and alienage are built into the system.