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 United States first attempted to acquire control of a canal on the Panamanian isthmus via the Hay-Herran Treaty of 1903, but the treaty was not ratified. Desperate to construct a canal, the United States saw the separatist movement as an opportunity. Despite the Bidlack-Mallarino Treaty of 1846 in which the United States would intervene in the event of a disorder between Panama and Colombia in Colombia’s favor, the United States prevented Colombian forces from moving across the isthmus to stop the Panamanian uprising. On November 4, 1903, the immediate support of the USA secured the Declaration of Independence of Panama from Colombia. In return, Panama signed the Hay–Bunau-Varilla Treaty three weeks later, granting the USA sovereign rights over the interoceanic canal that would be built over the following decade.