I know this is not a lighthouse in the USA, but the US played a big role here so I thought it might be allowed
Convention signed at Tangier May 31,
1865Convention Between the United States, Austria, Belgium, Spain, France, Great Britain, Italy, The Netherlands, Portugal, and Sweden on the One Part, and The Sultan of Morocco on the Other Part, Concerning the Administration and Upholding of the Light-House at Cape Spartel.
http://www.yale.edu/lawweb/avalon/intdip/usmulti/usmu009.htm http://www.lhdigest.com/database/uniquelighthouse.cfm?value=3536
