The Traité d'Unification was the legal document that established the existence of United Earth in 2130. Signed in Paris at the Place de la Concorde, future site of the Palais de la Concorde, this historic document served as United Earth's charter. (ST novel: Articles of the Federation)
- The TOS novel: Strangers from the Sky called this founding documentation the United Earth Accords, although much of the historical information in that book has been invalidated by subsequent canonical productions.
Though the United Earth Starfleet had been established and was operating a new headquarters building by October 2141 in San Francisco, there were three significant holdouts from the Traité: Australia, China, and the United States of America (then part of the Western Coalition). In 2150, those holdouts finally signed the Traité, completing the unification of Earth into a single planetary state on 14 July 2150. Celebrated throughout Earth as Unification Day, this led to the election of a new United Earth Prime Minister. (ST - Section 31 novel: Control)
- The ENT novel: The Good That Men Do establishes Australia be the last country to join the U.E., 15 years prior to the main events of the novel (which is set in 2155).