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.
Charlie Chan in Panama
Charlie Chan must stop a spy from destroying the Panama Canal, trapping a Navy fleet on its way to the Pacific after maneuvers in the Atlantic. As the U.S. fleet prepares to navigate the waters of the Panama Canal, Panama City becomes rife with spies.