Video : US begins sea patrols in North Atlantic

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Map of the maritime security zone created by the Declaration of Panama in October 1939, based on straight lines between points about 300 nautical miles offshore.

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| Artist: U.S. Department of State | Credit: http://images.library.wisc.edu/FRUS/EFacs/1939v05/reference/frus.frus1939v05.i0004.pdf#page=21

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