Panama Canal
Colombia, France, and later the United States controlled the territory surrounding the canal during construction. The US continued to control the canal and surrounding Panama Canal Zone until the 1977 Torrijos–Carter Treaties provided for handover to Panama. After a period of joint American–Panamanian control, in 1999, the canal was taken over by the Panamanian government. It is now managed and operated by the government-owned Panama Canal Authority.
Cristóbal, Colón
In 1904, after Panama's US-backed declaration of independence from Colombia, the Canal Commission set up its provisional headquarters in Cristóbal. By then, the United States had purchased the French Canal enterprise's assets in Panama and had secured use and control of the Canal Zone "in perpetuity." The Panama Railroad's assets also came under Canal Zone control, and its facilities became part of the Canal Zone town of Cristóbal.