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Today on my weekly trawl through the weirder recesses of Wikipedia I find details of an odd law still available to Americans to this day…

The Guano Islands Act is federal legislation passed by the U.S. Congress that enables citizens of the U.S. to take possession of islands containing guano deposits. The islands can be located anywhere, so long as they are not occupied and not within the jurisdiction of other governments. It also empowers the President of the United States to use the military to protect such interests and establishes the criminal jurisdiction of the United States.

Whenever any citizen of the United States discovers a deposit of guano on any island, rock, or key, not within the lawful jurisdiction of any other Government, and not occupied by the citizens of any other Government, and takes peaceable possession thereof, and occupies the same, such island, rock, or key may, at the discretion of the President, be considered as appertaining to the United States.

—first section of Guano Islands Act

In the 1840s, guano came to be prized as a source of saltpeter for gunpowder as well as an agricultural fertilizer. In 1855, the U.S. learned of rich guano deposits on islands in the Pacific Ocean. Congress passed the Guano Islands Act to take advantage of these deposits.

The act specifically allows the islands to be considered a possession of the U.S., but it also provided that the U.S. was not obliged to retain possession after the guano was exhausted. However, it did not specify what the status of the territory was after it was abandoned by private U.S. interests. The implication is that it would return to its former status as terra nullius.

This is the beginning of the concept of insular areas in U.S. territories. Up to this time, any territory acquired by the U.S. was considered to have become an integral part of the country unless changed by treaty and eventually to have the opportunity to become a state of the Union. With insular areas, land could be held by the federal government without the prospect of its ever becoming a state in the Union.

More than 100 islands have been claimed for the U.S. under the Guano Islands Act. Most are no longer considered United States territory.

In 1964, Leicester Hemingway, brother of author Ernest Hemingway, attempted to establish a country (or more appropriately, a micronation) dubbed the Republic of New Atlantis, on an 8 x 30 foot bamboo raft anchored with an engine block outside the territorial waters of Jamaica, using the Guano Islands Act as part of a claim to sovereignty. His apparent intention was to use the new country as the headquarters for his own International Marine Research Society, with which he planned to further marine research, as well as to protect Jamaican fishing. His claim was never recognized by either the USA or Jamaica, and the raft was destroyed in a storm in 1966.