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.
Isthmian Canal Commission
The Isthmian Canal Commission (often known as the ICC) was an American administration commission set up to oversee the construction of the Panama Canal in the early years of American involvement. Established the February 26, 1904, it was given control of the Panama Canal Zone over which the United States exercised sovereignty. The commission reported directly to Secretary of War William Taft.