Civil war

A Civil War is a conflict fought internally between a grouping of people. This could refer to people of the same nation engage in conflict bewteen each other, but in recent times civil war has been more often defined as a conflict between a larger society.

Examples

 * American Civil War - A war fought between the United States of America and the Confederate States of America - which was comprised of former states that had broken away from the Union. The war was fought from 1861 to 1865, and was a key moment in the elimination of slavery and repression on Earth.
 * Klingon Civil War - A brief war fought between two factions in the Klingon Empire in late 2366 and early 2367. Factions loyal to Gowron were able to defeat the Romulan backed Duras sisters after the Federation exposed Romulan involvement in the war.  This helped secure Gowron's position as Chancellor, and for a few more years preserved an alliance between the United Federation of Planets and the Klingon Empire.