Panama Canal Zone
The Panama Canal Zone () was an unincorporated territory of the United States from 1903 to 1979, centered on the Panama Canal and surrounded by the Republic of Panama. The zone consisted of the canal and an area generally extending on each side of the centerline, excluding Panama City and Colón, which otherwise would have been partly within the limits of the Zone. Its border spanned three of Panama's provinces. When reservoirs were created to assure a steady supply of water for the locks, those lakes were included within the Zone.
Panama Canal Zone
In 2008, during a minor controversy over whether Canal Zone–born John McCain, born in the Zone in 1936, was legally eligible for the presidency, the US Senate passed a non-binding resolution that McCain was a "natural born Citizen" of the United States.