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.
Panama–United States relations
The details of the arrangements for U.S. operation and defense of the Canal under the Panama Canal Treaty are spelled out in separate implementing agreements. The Canal Zone and its government ceased to exist when the treaties entered into force and Panama assumed complete jurisdiction over Canal Zone territories and functions, a process which was finalized on December 31, 1999.