History of the Panama Canal
During World War II, the canal proved a vital part of the U.S. military strategy, allowing ships to transfer easily between the Atlantic and Pacific. Politically, the Canal remained a territory of the United States until 1977, when the Torrijos–Carter Treaties began the process of transferring territorial control of the Panama Canal Zone to Panama, a process completed on 31 December 1999.
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.