United Earth

United Earth was the political entity that governed the planet Earth. It was not until 2150 that the last nation-state joined the government. (TNG episode "Attached")
 * It is often mistaken that Australia was the last nation, but this was just an example Dr. Crusher picked.

The United Earth government was headed by a Prime Minister. (DS9 TDW: "Eleven Hours Out"; ENT episode: "Demons")


 * According to the novel: "Starfleet: Year One", which is no longer put in the continuity of the novels with the advent of Enterprise, the United Earth Government was lead by a President.

Lydia Littlejohn was the President of United Earth at the end of the Earth-Romulan War, and during the foundation of the United Federation of Planets. (novel: "Starfleet: Year One")