Federation Civil War (Lost Frontier)

This term encompasses the in-fighting within the Federation that resulted from the decimation of the Infection, a nanite-based virus that attacked anything and everyone in its path. The Federation split into three distinct factions:


 * those that supported the original Federation
 * The One True Federation, a front for the Equity Corps
 * The Confederation of Planets

Starfleet forces became split between the various factions, and it meant starship went up against starship. The civil war lasted for years, before a final conflict in orbit of a pre-warp planet, Rifkin IV. After this time, the in-fighting eased off as the various factions turned their attention inward and began rebuilding themselves.