<prompt> Pedzisa mutsara unotevera: Chibvumirano chacho chakataura nguva yaizoendeswa mugero wacho, zvichiita kuti Panama iwane nzvimbo dzose nezvivako zvaiva munharaunda yomugero wacho. Mugumisiro wepakarepo zvikuru wechibvumirano ichi wakanga uri wokuti  <response>: Canal Zone, seboka, yakarega kuvapo pana October 1, 1979. Chikamu chokupedzisira chechibvumirano chacho chakapedzwa musi waDecember 31, 1999. Musi iwoyo, United States yakarega kudzora Panama Canal uye nzvimbo dzose dzaiva muPanama Canal Zone. 