All citizens of the United States who have resided or who shall after March 4, 1927 , reside in the island for one year shall be citizens of Puerto Rico . (Mar. 2, 1917, ch. 145, § 5a, as added Mar. 4, 1927, ch. 503, § 2, 44 Stat. 1418 ; amended May 17, 1932, ch. 190, 47 Stat. 158 .) Editorial Notes Codification Section was formerly classified to section 5a of Title 8 , Aliens and Nationality. Statutory Notes and Related Subsidiaries Change of Name “Puerto Rico ” substituted in text for “Porto Rico ” pursuant to act May 17, 1932 , which is classified to section 731a of this title .