What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 

Your task concerns the first listed appellant. The nature of this litigant falls into the category "natural person (excludes persons named in their official capacity or who appear because of a role in a private organization)". Your task is to determine the citizenship of this litigant as indicated in the opinion.

Opinion:
UNITED STATES of America ex rel. James CARTER, Petitioner-Appellant, v. Hon. Vincent R. MANCUSI, Superintendent of Attica Correctional Facility, Respondent-Appellee.
No. 690, Docket 72-1187.
United States Court of Appeals, Second Circuit.
Argued May 9, 1972.
Decided May 30, 1972.
Carol Berkman, New York City (Robert Kasanof, The Legal Aid Society, New York City), for appellant.
Hillel Hoffman, Asst. Atty. Gen., New York City (Louis J. Lefkowitz, Atty. Gen. of State of New York, Albany, N. Y., and Samuel A. Hirshowitz, First Asst. Atty. Gen., New York City, of counsel), for appellee.
Before FRIENDLY, Chief Judge, and MOORE and ANDERSON, Circuit Judges.
PER CURIAM:
The order is affirmed on the basis of Judge MacMahon’s opinion below. 342 F.Supp. 1356.

Question: This question concerns the first listed appellant. The nature of this litigant falls into the category "natural person (excludes persons named in their official capacity or who appear because of a role in a private organization)". What is the citizenship of this litigant as indicated in the opinion?

Choices:
not ascertained
US citizen
alien

Answer: 0