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 1977 Panama Canal Treaties entered into force on October 1, 1979. They replaced the 1903 Hay–Bunau-Varilla Treaty between the United States and Panama (modified in 1936 and 1955), and all other U.S.-Panama agreements concerning the Panama Canal, which were in force on that date. The treaties comprise a basic treaty governing the operation and defense of the Canal from October 1, 1979 to December 31, 1999 (Panama Canal Treaty) and a treaty guaranteeing the permanent neutrality of the Canal (Neutrality Treaty).