Board Thread:Lore Discussion/@comment-1600847-20160719191042/@comment-9062114-20160719195420

It seems pretty good, but I sincerely doubt Morrowind is part of the Empire.

Considering how Adril Arano's dialogue seems to quite heavily imply Morrowind's independence: "Just remember, Raven Rock is sovereign territory of House Redoran. This is Morrowind, not Skyrim. While you're here you will be expected to abide by our laws. Any questions?"

And

This: "Raven Rock started out as an Imperial settlement, but the empire decided to abandon it just as my people were first setting foot here. They left the town a shambles... but when House Redoran took over, we turned it around and it became ours. And even if it's been a struggle to make this island livable, we're proud to call it home."

I'm assuming The Great War claiming they were part of the Empire probably meant before the actual Great War. Which from Lore it seems to be heavily implied the Dunmer became estranged from the Empire post the events of the Great War. What likely happened is essentially the Entire province was either a) covered in Ash post the Red Mountain exploding b) taken over by Argonian invaders and Imperialists. Since Black Marsh is not part of the Mede Empire, that territory was added into the Argonian Empire instead. When House Redoran liberated Morrowind though, they might've declared their independence, which considering their distrust of outsiders makes sense.