United States territorial acquisitions
The Panama Canal Zone was an unorganized US territory located within the Republic of Panama. It was established under the Hay–Bunau-Varilla Treaty in 1903 and disestablished in 1979 under the Torrijos–Carter Treaties. Panama gained full control over the Panama Canal in 1999.
History of Panama
By the time the Canal opened in 1914, many Panamanians still questioned the validity of the treaty. The controversy surrounding the US's presence in Panama was a major issue in Panamanian politics throughout the following decades and revisions to the Hay—Bunau-Varilla Treaty in 1936 (Arias-Roosevelt/Hull-Alfaro Treaty) and 1955 (Remon-Eisenhower Treaty) both failed to adequately address the situation. The controversy would continue until the US agreed to hand over the Canal Zone wholly to Panama in the 1977 Torrijos-Carter Treaties.