48 U.S.C. § 733a

Citizens; residence in island of citizens of United States

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 .)