United States territorial acquisitions
The Panama Canal Zone was an unorganized US territory located within the Republic of Panama. It was established under the Hay–Bunau-Varilla Treaty in 1903 and disestablished in 1979 under the Torrijos–Carter Treaties. Panama gained full control over the Panama Canal in 1999.
United States nationality law
The law contains one other section of historical note, concerning the Panama Canal Zone and the nation of Panama. In , the law states that anyone born in the Canal Zone or in Panama itself, on or after February 26, 1904, to a mother or father who is a United States citizen, was "declared" to be a United States citizen at birth.