In November 2154, an temporary alliance consisting of Andorians, Humans, Tellarites, and Vulcans, was formed by United Earth Starfleet Captain Jonathan Archer of the Enterprise NX-01 to help with the rising Babel Crisis being instigated by the Romulan Star Empire. (ENT: "Babel One", "United", "The Aenar")
This joint alliance would prove successful and would lead to the formation of the Coalition of Planets and its successor, the United Federation of Planets. (ENT: "Demons", "Terra Prime", "These Are the Voyages...")