evidence: The United States claim was made in the 19th century by James W. Jennett[20] under the provisions of the Guano Islands Act.[21] Most claims made by the U.S. over the guano islands in this region were officially renounced in a treaty with Colombia, dated September 1972.[22] But whether or not Serranilla Bank was included in the agreement is disputed—there is no specific mention of the feature in the treaty and, as per Article 7 of the said treaty, only matters specifically mentioned in the document are subject to it. According to other records, as well as claims made within the ICJ, Colombia is recognised by the United States as having varying degrees of sovereignty over Serranilla Bank through the treaty of 1972, which took effect in September 1981.[17][23] The U.S. considers the reef to be an unorganized, unincorporated United States territory.[21][24] [...] - ^ "Application of the U.S. Constitution". United States Government, General Accounting Office. November 1997. http://www.gao.gov/archive/1998/og98005.pdf. Retrieved 2008-01-13. Page 39 states that U.S. sovereignty over Serranilla Bank is disputed. "Currently, the United States conducts maritime law enforcement operations in and around Serranilla Bank and Bajo Nuevo consistent with U.S. sovereignty claims." This is the only archived document from this source that mentions Serranilla Bank as an insular area.