Navassa became a U.S. insular area in October 1857, when a representative of the Baltimore Fertilizer Company took possession of the island in the name of the United States pursuant to the Guano Act of August 18, 1856 (Title 48, U.S. Code, sections 1411-19). In 1889 the island's actual operation passed to the Navassa Phosphate Company. All operations were abandoned in 1898, when the island became effectively uninhabited.