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.
History of Panama (1821–1903)
Nevertheless, Colombia continued to express interest in negotiating with the United States on building a canal. A treaty was signed in 1846 between the two countries. The treaty removed the existing restrictive tariffs and gave the United States and its citizens the right of free transit of persons and goods over any road or canal that might be constructed in the isthmus. In addition, the United States guaranteed the neutrality of the isthmus and Colombia's sovereignty over it, with a view to ensuring uninterrupted transit for the duration of the treaty, which was to be twenty years or as long thereafter as the parties gave no notice to revise it. Called the Mallarino–Bidlack Treaty of 1846, it was actually ratified and became effective in 1848.