In 1933, delegates from the United States and fourteen other countries met in Montevideo, Uruguay to define what it means to be a state. The resulting treaty from the Montevideo Convention established four basic criteria for statehood—essentially, what is required to be recognized as a country.
The state as a person of international law should possess the following qualifications:
1. A defined territory
Located on the military fortress of Rough Tower, Sealand is the smallest country in international waters. The country‘s national motto is “From the Sea, Freedom” (E Mare Libertas), reflecting its continuing struggle for liberty through the years.
Sealand has been an independent sovereign state since 1967. The Bates family governs the small state as hereditary royal rulers, each member with his own royal title.
Sealand has its own constitution, composed of a preamble and seven articles. The state’s constitution deals with several matters, including its status as a constitutional monarchy. While Sealand follows its own constitution, its legal system supposedly still adheres to British common law.
The Principality of Sealand: http://www.sealandgov.org/
Roman Mars and 99% Invisible: http://99percentinvisible.org/