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.
United States involvement in regime change
In 1903, the U.S. aided the secession of Panama from the Republic of Colombia. The secession was engineered by a Panamanian faction backed by the Panama Canal Company, a French–US corporation whose aim was the construction of a waterway across the Isthmus of Panama thus connecting the Atlantic and Pacific Oceans. In 1903, the U.S. signed the Hay-Herrán Treaty with Colombia, granting the United States use of the Isthmus of Panama in exchange for financial compensation. amidst the Thousand Days' War. The Panama Canal was already under construction, and the Panama Canal Zone was carved out and placed under United States sovereignty. The US did not transfer the zone back to Panama until 2000.