User blog comment:JAlbor/Wikia at E3 2012/@comment-24.62.196.37-20120527201301/@comment-4114145-20120530003955

The reason Red Mountain errupted was actually the because Ministry of Truth fell on the city of vivic because the the device used to keep the ministry in place the Ingenium was destroyed so the ministry fell on the city and also caused Red Mountain to errupt.

The reason the Argonians were able to take control of morrowind was because at this point both Almalexia and Sotha Sil are dead and Vivec has disappeared the eruption of Red Mountain had also left the Dunmer weakened.

It was also Vivec's disappearance that caused the Ministry of Truth to become unstable and require the Ingenium to stay in place Also the Umbriel appeared in Morrowind in 4E 40 the Argonians had taken control of Morrowind in 4E 5-6.