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.
Mexico–Panama relations
During the 1970s, Mexico became a vocal supporter for dialogue between Panama and the United States for eventual Panamanian control of the Panama Canal. In 1977, Panama and the United States signed the Torrijos–Carter Treaties giving Panama eventual control of the canal in December 1999. During the 1980s, foreign ministers of Colombia, Mexico, Panama and Venezuela created the Contadora Group in order to diplomatically try to resolve the crisis facing many Central American nations at the time.