The An-Xileel were largely responsible for the Argonian invasion, and subsequent occupation, of Morrowind. The An-Xileel stopped their advance in Morrowind decades ago, and haven’t showed the slightest interest in doing anything since then. They have, however, prevented the Empire from reclaiming that territory.
According to the Imperial perspective, the An-xileel “were entirely nativistic in their views, interested only in purging the former colonial influences and returning Black Marsh to whatever state they imagined it had been in before it was ruled by foreign powers.”
- During the events of Skyrim, the An-Xileel and Argonia are the only significant political factions that do not take a significant blow due to the Dragonborn's actions aside from either the Empire or the Stormcloaks, depending on whom the Dragonborn chooses to side with in the Civil War questline.