8 U.S.C.
United States Code, 2011 Edition
Title 8 - ALIENS AND NATIONALITY
CHAPTER 12 - IMMIGRATION AND NATIONALITY
SUBCHAPTER III - NATIONALITY AND NATURALIZATION
Part I - Nationality at Birth and Collective Naturalization
Sec. 1402 - Persons born in Puerto Rico on or after April 11, 1899
From the U.S. Government Publishing Office, www.gpo.gov

§1402. Persons born in Puerto Rico on or after April 11, 1899

All persons born in Puerto Rico on or after April 11, 1899, and prior to January 13, 1941, subject to the jurisdiction of the United States, residing on January 13, 1941, in Puerto Rico or other territory over which the United States exercises rights of sovereignty and not citizens of the United States under any other Act, are declared to be citizens of the United States as of January 13, 1941. All persons born in Puerto Rico on or after January 13, 1941, and subject to the jurisdiction of the United States, are citizens of the United States at birth.

(June 27, 1952, ch. 477, title III, ch. 1, §302, 66 Stat. 236.)