In an alternate timeline, the Interstellar Coalition was a political union formed between the governments of Vulcan, Andor, Tellar, Denobula, Coridan III and others, following the successful strike by Terra Prime against the negotiations for the Coalition of Planets in 2155. This union was formed in part due to the continued efforts of Captain Jonathan Archer, and was formalized at Babel in 2161.
The Interstellar Coalition was a major rival of United Earth for many years, and the two engaged in numerous trade wars and border skirmishes. However, both powers temporarily allied in a war against the Klingon Empire in the 2240s, and joint forces fought at the Battle of Donatu V. In 2264, United Earth petitioned to join the Interstellar Coalition. (Star Trek: Myriad Universes novel: A Less Perfect Union)