Board Thread:Lore Discussion/@comment-27389023-20160612112514/@comment-26145872-20170217175357

Yes, High Rock is still a province of the Empire and, as of the Fourth Era, is arguably considered to be the most supportive, peaceful, and prosperous member of the Empire aside from Cyrodiil. Morrowind, despite being destroyed by Red Mountain and being partially invaded by the Argonians, has not officially seceded nor has the Emporer renounced Morrowind. Thus, it is still considered a province of the Empire.