<prompt> Qedela umusho olandelayo: Lesi sivumelwano sakha isimiso sesikhathi sokudluliselwa komsele, okwaholela ekudluliselweni okuphelele kwawo wonke umhlaba nezakhiwo endaweni yomsele ePanama. Umphumela osheshayo walesi sivumelwano kwaba ukuthi  <response>: ICanal Zone, njengenhlangano, yayeka ukuba khona ngo - October 1, 1979. Isigaba sokugcina salesi sivumelwano saphothulwa ngo-December 31, 1999. Ngalolu suku, i - United States yayeka ukulawula uMsele WasePanama nazo zonke izindawo ezaziyiPanama Canal Zone. 