[Code of Federal Regulations] [Title 22, Volume 1] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 22CFR51.51] [Page 250] TITLE 22--FOREIGN RELATIONS CHAPTER I--DEPARTMENT OF STATE PART 51_PASSPORTS--Table of Contents Subpart C_Evidence of U.S. Citizenship or Nationality Sec. 51.51 Former nationals of Spain or Denmark. Former nationals of Spain or Denmark who acquired nationality or citizenship of the United States under an act of Congress or treaty by virtue of residence in territory under the sovereignty of the United States shall submit evidence of their former nationality and of their residence in such territory.