4 SESSIONS v. MORALES-SANTANA Opinion of the Court under the same terms as a married citizen parent. Section 1409(c)—a provision applicable only to unwed U. S.-citizen mothers—states an exception to the physical-presence requirements of §§1401 and 1409(a). Under §1409(c)’s exception, only one year of continuous physical presence is required before unwed mothers may pass citizenship to their children born abroad. B Respondent Luis Ramón Morales-Santana moved to the United States at age 13, and has resided in this country most of his life. Now facing deportation, he asserts U. S. citizenship at birth based on the citizenship of his biologi­ cal father, José Morales, who accepted parental responsi­ bility and included Morales-Santana in his household. José Morales was born in Guánica, Puerto Rico, on March 19, 1900. Record 55–56. Puerto Rico was then, as it is now, part of the United States, see Puerto Rico v. Sanchez Valle, 579 U. S. ___, ___–___ (2016) (slip op., at 2– 4); 8 U. S. C. §1101(a)(38) (1958 ed.) (“The term United States . . . means the continental United States, Alaska, Hawaii, Puerto Rico, Guam, and the [U. S.] Virgin Is­ lands.” (internal quotation marks omitted)); §1101(a)(38) (2012 ed.) (similar), and José became a U. S. citizen under the Organic Act of Puerto Rico, ch. 145, §5, 39 Stat. 953 (a predecessor to 8 U. S. C. §1402). After living in Puerto Rico for nearly two decades, José left his childhood home on February 27, 1919, 20 days short of his 19th birthday, therefore failing to satisfy §1401(a)(7)’s requirement of five years’ physical presence after age 14. Record 57, 66. He did so to take up employment as a builder-mechanic for a U. S. company in the then-U. S.-occupied Dominican Republic. Ibid.4 —————— 4 See generally B. Calder, The Impact of Intervention: The Dominican Republic During the U. S. Occupation of 1916–1924, pp. 17, 204–205 (1984) (describing establishment of a U. S. military government in the