Panama Canal Zone.
The Panama Canal Zone is under the control of a governor who is appointed by the President of the United States.
"It is neutral and open to vessels of commerce and war of all nations, but war vessels must pass through without delay and while in the canal cannot load or unload troops or munitions of war."
The cost of the construction of the canal was about $400,000,000. It shortens the voyage from New York to San Francisco 8,000 miles.