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
The US intent to influence the area, especially the Panama Canal's construction and control, led to the separation of Panama from Colombia in 1903 and its establishment as a nation. When the Senate of Colombia rejected the Hay–Herrán Treaty on January 22, 1903, the United States decided to support and encourage the Panamanian separatist movement